Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Basis of Presentation - Additional Information (Detail)

v3.20.2
Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Jul. 22, 2020
Jul. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Basis Of Presentation [Line Items]            
Aggregate number of units sold 18,000          
Series F Preferred stock, shares issued     1,000 0    
Warrant issued 45,000,000          
Proceeds from offering, net of underwriting discounts and commissions $ 16,100 $ 8,000        
Cash and cash equivalents, including restricted cash     $ 19,159 $ 6,101 $ 2,403 $ 8,356
Accounts receivable, net     3,393 $ 8,760    
Equity raise of gross proceeds     24,000      
SWK Loan            
Basis Of Presentation [Line Items]            
Working capital     14,600      
Pacific Mercantile Bank            
Basis Of Presentation [Line Items]            
Available balance     $ 1,000      
Series F Convertible Preferred Stock            
Basis Of Presentation [Line Items]            
Series F Preferred stock, shares issued 18,000