Quarterly report pursuant to Section 13 or 15(d)

DEBT - Series D Convertible Notes due March 2022 (Details)

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DEBT - Series D Convertible Notes due March 2022 (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 19, 2021
Dec. 18, 2020
Sep. 30, 2021
Mar. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 17, 2020
Mar. 31, 2020
Debt Instrument [Line Items]                  
Loans and borrowings, net of current portion     $ 13,077,000   $ 13,077,000   $ 33,843,000    
Gain on extinguishment of debt, net of unamortized debt financing costs         $ 3,375,000 $ 0      
Convertible notes due 2022 | Convertible notes                  
Debt Instrument [Line Items]                  
Debt instrument, face amount       $ 27,750,000          
Interest rate       8.00%         10.00%
Common stock shares, guaranteed and secured (in shares)       1,300,002          
Convertible, common shares, minimum       $ 1,000,000          
Convertible, conversion price (USD per share)   $ 30.62   $ 11.00       $ 11.00  
Share price, trigger event (USD per share)       $ 13.54          
Initial public offering, volume period       10 days          
Convertible notes due 2024       $ 27,750,000          
Redemption price, percentage 90.00%                
Gain on extinguishment of debt, net of unamortized debt financing costs     $ 2,267,000            
Convertible notes due 2022 | Convertible notes | Series C Preferred Stock | Preferred Stock                  
Debt Instrument [Line Items]                  
Loans and borrowings, net of current portion       $ 30,258,000          
Convertible notes due 2022 | Convertible notes | Minimum                  
Debt Instrument [Line Items]                  
Share price, trigger event (USD per share)       $ 13.54          
Convertible notes due 2022, amendment | Convertible notes                  
Debt Instrument [Line Items]                  
Interest rate   8.00%              
Quarterly interest, satisfaction of payment through issued of common stock, percentage   95.00%              
Quarterly interest, satisfaction of payment through issued of common stock, volume weighted average period (VWAP)   10 days              
Quarterly interest, satisfaction of payment through issued of common stock, volume weighted average. days before interest payment due   3 days              
Quarterly interest, satisfaction of payment through issued of common stock, multiplier   4              
Option, equity financing, issuance of equity securities, net proceeds   $ 25,000,000              
Option, equity financing, pro rata share of total securities issued   25.00%              
Option not taken after equity financing, repayment period   5 days              
Convertible notes due 2022, amendment | Convertible notes | Maximum                  
Debt Instrument [Line Items]                  
Periodic payment, interest   $ 2,000,000