General form of registration statement for all companies including face-amount certificate companies

Description of Business and Basis of Presentation - Going Concern, and Liquidity and Capital Resources (Details)

v3.21.2
Description of Business and Basis of Presentation - Going Concern, and Liquidity and Capital Resources (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2021
May 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 17, 2020
Apr. 18, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]                    
Accumulated deficit     $ 148,861   $ 148,861   $ 122,776 $ 114,020    
Net loss     (13,548) $ (5,702) (26,086) $ (10,484) $ (21,807) $ (25,678)    
Debt Instrument [Line Items]                    
Principal amount   $ 53,500                
Term loan                    
Debt Instrument [Line Items]                    
Principal amount   35,000 15,000   15,000       $ 5,200 $ 5,200
Borrowings   15,000                
Term loan | Subsequent Event                    
Debt Instrument [Line Items]                    
Borrowings $ 5,000                  
Line of credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Principal amount   10,000 $ 10,000   $ 10,000          
Secured equipment loan facility                    
Debt Instrument [Line Items]                    
Principal amount   $ 8,500