Quarterly report pursuant to Section 13 or 15(d)

Convertible Notes and PPP Term Note - Additional Information (Details)

v3.21.2
Convertible Notes and PPP Term Note - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 14, 2020
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Convertible notes        
Debt Instrument [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value   $ 180,300,000 $ 180,300,000 $ 197,700,000
Senior Secured Convertible Notes Due 2024 | Convertible notes        
Debt Instrument [Line Items]        
Interest rate   4.00% 4.00%  
Face amount   $ 200,000,000 $ 200,000,000 $ 200,000,000
Interest expense   $ 2,000,000 $ 6,000,000  
Conversion price (in usd per share)   $ 0.03529 $ 0.03529  
Senior Secured Convertible Notes Due 2024 | Convertible notes | Period ending March 31, 2022        
Debt Instrument [Line Items]        
Minimum sales backlog   $ 25,000,000 $ 25,000,000  
Senior Secured Convertible Notes Due 2024 | Convertible notes | Period ending Jun 30, 2022        
Debt Instrument [Line Items]        
Minimum sales backlog   50,000,000 50,000,000  
Senior Secured Convertible Notes Due 2024 | Convertible notes | Period ending September 30, 2022        
Debt Instrument [Line Items]        
Minimum sales backlog   75,000,000 75,000,000  
Senior Secured Convertible Notes Due 2024 | Convertible notes | Period ending December 31, 2022        
Debt Instrument [Line Items]        
Minimum sales backlog   $ 100,000,000 100,000,000  
Paycheck Protection Program Term Note        
Debt Instrument [Line Items]        
CARES Act, proceeds from loans payable $ 1,400,000   $ 1,400,000  
CARES Act, interest rate 1.00%