Quarterly report pursuant to Section 13 or 15(d)

Convertible Note and PPP Term Note (Details Textual)

v3.21.1
Convertible Note and PPP Term Note (Details Textual) - USD ($)
3 Months Ended
Apr. 14, 2020
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Convertible notes, at fair value   $ 182,200,000 $ 197,700,000
Senior Secured Convertible Notes Due 2024 | Convertible Notes Payable      
Debt Instrument [Line Items]      
Interest rate   4.00%  
Face amount   $ 200,000,000.0 200,000,000.0
Convertible notes, at fair value   182,200,000 $ 197,700,000
Fair value adjustment, liability   $ 15,500,000  
Conversion price (in usd per share)   $ 35.29  
Interest income, net   $ 2,000,000.0  
Senior Secured Convertible Notes Due 2024 | Convertible Notes Payable | Period ending March 31, 2022      
Debt Instrument [Line Items]      
Minimum sales backlog   25,000,000.0  
Senior Secured Convertible Notes Due 2024 | Convertible Notes Payable | Period ending Jun 30, 2022      
Debt Instrument [Line Items]      
Minimum sales backlog   50,000,000.0  
Senior Secured Convertible Notes Due 2024 | Convertible Notes Payable | Period ending September 30, 2022      
Debt Instrument [Line Items]      
Minimum sales backlog   75,000,000.0  
Senior Secured Convertible Notes Due 2024 | Convertible Notes Payable | Period ending December 31, 2022      
Debt Instrument [Line Items]      
Minimum sales backlog   $ 100,000,000.0  
Paycheck Protection Program Term Note      
Debt Instrument [Line Items]      
CARES Act, proceeds from loans payable $ 1,400,000    
CARES Act, interest rate 1.00%