BIOLASE, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

Debt - Additional Information (Detail)						1 Months Ended						3 Months Ended		6 Months Ended	9 Months Ended
Debt - Additional Information (Detail)	May 22, 2020 USD ($)	Apr. 13, 2020 USD ($)	Oct. 28, 2019 USD ($)	Nov. 09, 2018 USD ($) d $ / shares shares	Sep. 27, 2018 USD ($) $ / shares	Apr. 30, 2021	Sep. 30, 2020 $ / shares	Aug. 31, 2020 $ / shares	Jul. 31, 2020	Mar. 31, 2020 USD ($) $ / shares shares	Nov. 30, 2019 $ / shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 $ / shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Feb. 24, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Jul. 23, 2020 USD ($) shares	Apr. 14, 2020 USD ($)	Dec. 31, 2019 $ / shares	May 31, 2019 $ / shares shares	May 07, 2019 $ / shares	Nov. 14, 2018 $ / shares	Mar. 06, 2018 USD ($) $ / shares
Debt Instrument [Line Items]
Borrowings under lines of credit															$ 0	$ 3,000,000
Debt issuance costs															25,000	75,000
Common stock value												$ 153,000			153,000			$ 98,000	$ 1,000
EBITDA target												$ (2,657,000)	$ (3,667,000)		$ (12,001,000)	(12,997,000)
Preferred stock, shares issued \| shares												0			0			1,000
Preferred stock par value \| $ / shares												$ 0.001			$ 0.001			$ 0.001
Non current term loans												$ 13,514,000			$ 13,514,000			$ 16,186,000
Interest expense												$ 600,000	$ 600,000		$ 1,700,000	1,800,000
Weighted-average interest rate												12.25%			12.25%
Warrants adjusted exercise price \| $ / shares														$ 0.60
Warrants, estimated fair value															$ 0	(5,850,000)
Change in fair value of warrants															$ 0	$ (5,850,000)
Series F Convertible Preferred Stock
Debt Instrument [Line Items]
Preferred stock, shares issued \| shares																			18,000
SWK Warrants
Debt Instrument [Line Items]
Warrants adjusted strike price \| $ / shares										$ 0.49	$ 1.00
Warrants issued to purchase shares of common stock \| shares										487,198
Initial exercise price of warrants \| $ / shares				$ 1.34						$ 0.39
Weighted average exercise price of warrants \| $ / shares				$ 1.34						$ 0.39
Warrants expire date				Nov. 09, 2026
Number of trading days of average closing price of common stock \| d				10
Warrants expiration period				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, estimated fair value				$ 400,000
Additional Warrants issued to purchase shares of common stock \| shares										63,779
Change in fair value of warrants				400,000
Warrants effective-interest method amortization period															5 years
DPG Warrants
Debt Instrument [Line Items]
Finder's fee				$ 400,000
Warrants expire date				Nov. 09, 2026
Class Of Warrant Or Rights Expiration Date				Nov. 09, 2026
Number of trading days of average closing price of common stock \| d				10
Warrants expiration period				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, estimated fair value				$ 300,000
Change in fair value of warrants				$ 300,000
Adjusted exercise price of warrants \| $ / shares							$ 0.62	$ 0.38
DPG Warrants \| Warrants Issued on November 9, 2018
Debt Instrument [Line Items]
Initial exercise price of warrants \| $ / shares																					$ 0.88			$ 1.34
Weighted average exercise price of warrants \| $ / shares																					0.88			$ 1.34
DPG Warrants \| Warrants Issued on May, 2019
Debt Instrument [Line Items]
Initial exercise price of warrants \| $ / shares																					1.42		$ 2.17
Weighted average exercise price of warrants \| $ / shares																					$ 1.42		$ 2.17
Original Western Alliance Warrant
Debt Instrument [Line Items]
Initial exercise price of warrants \| $ / shares																									$ 2.35
Weighted average exercise price of warrants \| $ / shares																									$ 2.35
Western Alliance Warrant
Debt Instrument [Line Items]
Initial exercise price of warrants \| $ / shares					$ 2.13
Weighted average exercise price of warrants \| $ / shares					$ 2.13
Warrants expire date					Sep. 27, 2028
SWK Warrants and DPG Warrants
Debt Instrument [Line Items]
Warrants issued to purchase shares of common stock \| shares																						149,727
Initial exercise price of warrants \| $ / shares																						$ 2.17
Weighted average exercise price of warrants \| $ / shares																						$ 2.17
PPP Loan
Debt Instrument [Line Items]
Loan forgiveness description of period															The review may include the loan forgiveness application, as well as whether the Company received the proper loan amount. There can be no assurance as to the result of any such SBA review.
Non current term loans												$ 0			$ 0			2,980,000
Period for review of forgiveness of loan															6 years
EIDL Loan
Debt Instrument [Line Items]
Note interest rate per annum	3.75%
Non current term loans												150,000			$ 150,000			150,000
Loan principal amount	$ 150,000,000
Loan interest rate per annum	3.75%
Loan periodic payment terms	installment payments, including principal and interest, are due monthly beginning in July 2021 and are
Loan balance payment terms	payable through July 2050.
Extension of loan due date						2022
Maximum \| SWK Warrants
Debt Instrument [Line Items]
Warrants issued to purchase shares of common stock \| shares				372,023,000
Warrants, estimated fair value										$ 100,000
Change in fair value of warrants										$ 100,000
Maximum \| DPG Warrants
Debt Instrument [Line Items]
Warrants issued to purchase shares of common stock \| shares				279,851
Maximum \| Original Western Alliance Warrant
Debt Instrument [Line Items]
Warrants issued to purchase shares of common stock equal value																									$ 120,000
Maximum \| Western Alliance Warrant
Debt Instrument [Line Items]
Warrants issued to purchase shares of common stock equal value					$ 120,000
Maximum \| PPP Loan
Debt Instrument [Line Items]
Nonpayroll costs eligible for loan forgiveness percentage									40.00%
Minimum \| PPP Loan
Debt Instrument [Line Items]
Nonpayroll costs eligible for loan forgiveness percentage									25.00%
Pacific Mercantile Bank \| PPP Loan
Debt Instrument [Line Items]
Loan granted amount from bank																				$ 2,980,000
Note issued date		Apr. 13, 2020
Note maturity date		Apr. 13, 2022
Note interest rate per annum		1.00%
Note payable commencing date		Nov. 01, 2020
Note prepayment penalties		$ 0
Non current term loans																		3,000,000.0
Loan interest rate per annum		1.00%
SWK Loan
Debt Instrument [Line Items]
Repayments of lines of credit				$ 700,000
Line of credit facility term				5 years
Borrowings under lines of credit															14,300,000
Debt instrument, principal repayments beginning term				2022
Debt instrument, maturity term				2024
Non current term loans												14,300,000			$ 14,300,000			14,300,000
SWK Loan \| LIBOR
Debt Instrument [Line Items]
Line of credit facility interest rate description				or another index that approximates LIBOR as close as possible if and when LIBOR no longer exists.
Line of credit facility bearing floating interest rate per annum															10.00%
SWK Loan \| Credit Agreement, Seventh Amendment
Debt Instrument [Line Items]
Incremental amendment fee															$ 25,000
SWK Loan \| Maximum \| Credit Agreement, Seventh Amendment
Debt Instrument [Line Items]
Debt instrument covenants unencumbered liquid assets																	$ 15,000,000
SWK Loan \| Minimum \| Credit Agreement, Seventh Amendment
Debt Instrument [Line Items]
Debt instrument covenants unencumbered liquid assets																	$ 15,000,000
Loan Agreement \| Pacific Mercantile Bank
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 3,000,000
Maximum borrowing base percentage of eligible accounts			90.00%
Maximum borrowing base percentage of eligible inventory			75.00%
Line of credit facility expiration date			Oct. 28, 2021
Interest rate			1.50%
Line of credit, outstanding borrowings												0			0			0
Line of credit facility, unused availability												$ 2,800,000			$ 2,800,000			$ 2,300,000
Loan Agreement \| Pacific Mercantile Bank \| Minimum
Debt Instrument [Line Items]
Interest rate			6.00%
Loan Agreement \| Exim Bank
Debt Instrument [Line Items]
Line of credit facility initial and annual fee			$ 52,500