Redeemable Preferred Stock and Stockholders' Equity - Additional Information (Detail)

v3.22.2.2

Redeemable Preferred Stock and Stockholders' Equity - Additional Information (Detail)									1 Months Ended			3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 27, 2022 USD ($) $ / shares shares	Sep. 28, 2020 $ / shares	Jul. 23, 2020 USD ($) $ / shares shares	Jun. 08, 2020 USD ($) $ / shares shares	Nov. 14, 2018 USD ($) Customer $ / shares shares	Nov. 09, 2018 USD ($) Customer $ / shares shares	Sep. 27, 2018 USD ($) $ / shares	Mar. 06, 2018 USD ($) $ / shares	Sep. 30, 2020 $ / shares	Aug. 31, 2020 $ / shares	Mar. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 30, 2020 $ / shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Mar. 01, 2022 $ / shares	Feb. 28, 2021 USD ($)	Nov. 30, 2019 $ / shares	May 31, 2019 $ / shares shares
Temporary Equity And Stockholders Equity [Line Items]
Common stock, shares authorized | shares												180,000,000				180,000,000		180,000,000
Common stock, shares issued | shares												7,144,000				7,144,000		7,142,000
Common stock, par value | $ / shares												$ 0.001				$ 0.001		$ 0.001
Series F Preferred stock, shares issued | shares												0				0		0
Common stock value												$ 7,000				$ 7,000		$ 6,000
Expected term (years)													6 years 1 month 6 days				6 years 1 month 6 days
Volatility												0.00%	111.00%			0.00%	111.00%
Risk-free interest rate												0.00%	0.98%			0.00%	0.86%
Conversion of preferred stock into common stock | shares													261				261
Common stock authorized for issuance | shares												41,000,000				41,000,000
Compensation expense related to stock options												$ 600,000	$ 200,000			$ 1,700,000	$ 1,500,000
Total unrecognized compensation expense												1,800,000	800,000			1,800,000	800,000
Accrued liabilities												6,919,000				6,919,000		8,276,000			$ 600,000
Other liabilities												260,000				$ 260,000		330,000
Unrecognized share based compensation expense to be recognized over weighted-average period																1 year 1 month 6 days
Allocated Share-based Compensation Expense												591,000	$ 192,000			$ 1,691,000	$ 1,488,000
Additional paid-in-capital												$ 301,196,000				$ 301,196,000		$ 293,325,000
Other offering expenses				$ 700,000
Outstanding stock options, RSUs and warrants excluded from diluted loss per share | shares																2,600,000	1,000,000.0
Warrants adjusted exercise price | $ / shares															$ 15.00
June 2022 Warrants [Member]
Temporary Equity And Stockholders Equity [Line Items]
Weighted average exercise price of warrants | $ / shares	$ 0.001
Sale of common stock, shares | shares	678,745,000
Proceeds from offering	$ 6,500,000
Combined purchase price of share and warrant | $ / shares	$ 4.625
June 2022 Pre-Funded Warrants [Member]
Temporary Equity And Stockholders Equity [Line Items]
Equity raise of gross proceeds	$ 5,600,000
Warrant issued | shares	726,660,000
Combined purchase price of share and warrant | $ / shares	$ 4.624
July 2020 Warrants
Temporary Equity And Stockholders Equity [Line Items]
Proceeds from issuance of warrants			$ 15,300,000
Warrants issued in connection with debt instruments			$ 15,300,000
Equity, Fair Value Adjustment																			$ 9,500,000
Change in fair value of warrants																			5,800,000
Issuance costs for common stock warrants																			1,600,000
Allocation to preferred stock and warrants before issuance costs																$ 15,300,000
July 2020 Warrants | Rights Offering
Temporary Equity And Stockholders Equity [Line Items]
Warrant issued | shares			45,000,000
Allocated to the warrants based upon fair values			$ 15,300,000
Weighted average exercise price of warrants | $ / shares			$ 10.00
Dividend yield																0.00%
Series F Convertible Preferred Stock and July 2020 Warrants | Rights Offering
Temporary Equity And Stockholders Equity [Line Items]
Weighted average exercise price of warrants | $ / shares												$ 8.50				$ 8.50
Expected term (years)																5 years
Closing price of common stock | $ / shares																$ 11.00
Volatility																109.80%
Risk-free interest rate																0.27%
Sale of common stock, shares | shares			18,000
Deemed dividend on convertible preferred stock																			$ 14,700,000
Series F Convertible Preferred Stock
Temporary Equity And Stockholders Equity [Line Items]
Temporary equity preferred stock, shares authorized | shares			18,000,000
Conversion price | $ / shares			$ 10.00
Series G Preferred stock, shares authorized | shares			18,000,000
Options and restricted stock units outstanding | shares																		251,000
Allocation to preferred stock and warrants before issuance costs																$ 2,700,000
Series F Preferred Stock and July Two Thousand Twenty Amendment
Temporary Equity And Stockholders Equity [Line Items]
Weighted average exercise price of warrants | $ / shares		$ 5.25
Expected term (years)		5 years
Closing price of common stock | $ / shares		$ 7.00
Volatility		109.50%
Risk-free interest rate		0.26%
Dividend yield		0.00%
Series F Convertible Preferred Stock
Temporary Equity And Stockholders Equity [Line Items]
Common stock value			$ 1,000,000
Proceeds from issuance of warrants			2,700,000
Proceeds of common stock and warrants			18,000,000.0
Warrants issued in connection with debt instruments			2,700,000
Deemed dividend on convertible preferred stock			$ 2,700,000													$ 200,000		$ 500,000
Convertible preferred stock, shares outstanding | shares												0				0
Preferred stock par value | $ / shares			$ 0.001
Series F Convertible Preferred Stock | Rights Offering
Temporary Equity And Stockholders Equity [Line Items]
Proceeds allocated to the warrants based upon fair values			$ 2,700,000
Series G Redeemable Preferred Stock
Temporary Equity And Stockholders Equity [Line Items]
Temporary equity, par value | $ / shares																				$ 0.001
Private Placement
Temporary Equity And Stockholders Equity [Line Items]
Warrant issued | shares				10,800,000
Proceeds from offering, net of underwriting discounts and commissions														$ 5,600,000
Weighted average exercise price of warrants | $ / shares				$ 0.515
Temporary equity numbers of shares sold | shares				10,800,000
Private Placement | June 2022 Warrants [Member]
Temporary Equity And Stockholders Equity [Line Items]
Warrant issued | shares	1,405,405,000
Private Placement | Series F Convertible Preferred Stock
Temporary Equity And Stockholders Equity [Line Items]
Common stock, shares issued | shares												652,500				652,500
Public Offering
Temporary Equity And Stockholders Equity [Line Items]
Warrant expiration date				Jun. 10, 2025
Proceeds from offering				$ 6,900,000
Combined purchase price of share and warrant | $ / shares				$ 16.00
Maximum
Temporary Equity And Stockholders Equity [Line Items]
Temporary equity preferred stock, shares authorized | shares												1,000,000				1,000,000
Series G Preferred stock, shares authorized | shares												1,000,000				1,000,000
2002 Stock Incentive Plan
Temporary Equity And Stockholders Equity [Line Items]
Common stock authorized for issuance | shares												124,400,000				124,400,000
Options available for future grants | shares												0				0
2018 Long-Term Incentive Plan
Temporary Equity And Stockholders Equity [Line Items]
Common stock authorized for issuance | shares												100,000				100,000
Options and restricted stock units outstanding | shares												1,000,000.0				1,000,000.0
2018 Long-Term Incentive Plan | Common Stock
Temporary Equity And Stockholders Equity [Line Items]
Common stock authorized for issuance | shares												1,500,000				1,500,000
Restricted Stock Units (RSUs)
Temporary Equity And Stockholders Equity [Line Items]
Options and restricted stock units outstanding | shares												23,000,000				23,000,000
Phantom Share Units (PSUs)
Temporary Equity And Stockholders Equity [Line Items]
Other liabilities												$ 200,000				$ 200,000		$ 300,000
Allocated Share-based Compensation Expense												100,000				100,000
Additional paid-in-capital												100,000		100,000		$ 100,000
Shares issued in period | shares																30,000		400,000
Stock Appreciation Rights (SARs)
Temporary Equity And Stockholders Equity [Line Items]
Accrued liabilities																		$ 300,000
Allocated Share-based Compensation Expense												$ 0				$ 300,000
Additional paid-in-capital														$ 500,000
Shares issued in period | shares																		40,000
Original Western Alliance Warrant
Temporary Equity And Stockholders Equity [Line Items]
Conversion price | $ / shares								$ 58.75
Weighted average exercise price of warrants | $ / shares							$ 53.25
Warrants expire date							Sep. 27, 2028
Original Western Alliance Warrant | Maximum
Temporary Equity And Stockholders Equity [Line Items]
Warrants issued to purchase shares of common stock equal value							$ 120,000,000	$ 120,000
SWK Warrants
Temporary Equity And Stockholders Equity [Line Items]
Warrant issued | shares						372,023,000
Weighted average exercise price of warrants | $ / shares						$ 33.50					$ 9.75											$ 25.00
Change in fair value of warrants						$ 400,000					$ 100,000
Warrants expire date						Nov. 09, 2026
Warrants adjusted exercise price | $ / shares						$ 9.75
Warrant issued | shares											487,198,000
Number Of Trading Days | Customer						10
Warrants Fair Value Assumptions Expected Term						8 years
Warrants fair value assumptions, expected volatility rate						81.79%
Warrants fair value assumptions annual dividend per share | $ / shares						$ 0.00
Warrants fair value assumptions, risk-free interest rate						3.13%
Warrants adjusted strike price | $ / shares											$ 12.25
SWK Warrants | Maximum
Temporary Equity And Stockholders Equity [Line Items]
Weighted average exercise price of warrants | $ / shares												$ 22.00				$ 22.00
SWK Warrants | Minimum
Temporary Equity And Stockholders Equity [Line Items]
Weighted average exercise price of warrants | $ / shares												33.50				$ 33.50
DPG Warrants
Temporary Equity And Stockholders Equity [Line Items]
Warrant issued | shares																							149,727,000
Weighted average exercise price of warrants | $ / shares					$ 33.50																		$ 54.25
Expected term (years)																5 years
Change in fair value of warrants					$ 300,000
Warrants expire date					Nov. 09, 2026
Warrant issued | shares					279,851,000
Number Of Trading Days | Customer					10
Warrants Fair Value Assumptions Expected Term					8 years
Warrants fair value assumptions, expected volatility rate					8179.00%
Warrants fair value assumptions annual dividend per share | $ / shares					$ 0.00
Warrants fair value assumptions, risk-free interest rate					313.00%
Finder's fee						$ 400,000
Adjusted exercise price of warrants | $ / shares									$ 15.50	$ 9.50
DPG Warrants | Maximum
Temporary Equity And Stockholders Equity [Line Items]
Weighted average exercise price of warrants | $ / shares												35.50				$ 35.50
DPG Warrants | Minimum
Temporary Equity And Stockholders Equity [Line Items]
Weighted average exercise price of warrants | $ / shares												54.25				$ 54.25
June 2020 Warrants
Temporary Equity And Stockholders Equity [Line Items]
Common stock, shares issued | shares			100,000
Proceeds of common stock and warrants																$ 6,200,000
Weighted average exercise price of warrants | $ / shares												$ 10.5				$ 10.5
Expected term (years)																5 years
Closing price of common stock | $ / shares																$ 13.5
Volatility																109.80%
Risk-free interest rate																0.45%
Allocation to preferred stock and warrants before issuance costs																$ 3,000,000.0
Dividend Declared																0
Allocation to common stock and warrants before issuance costs																$ 3,900,000
June 2020 Warrants | Series F Convertible Preferred Stock and July 2020 Warrants
Temporary Equity And Stockholders Equity [Line Items]
Warrant issued | shares			45,000,000,000