Quarterly report pursuant to Section 13 or 15(d)

Description of the Business and Financial Condition (Details Narrative)

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Description of the Business and Financial Condition (Details Narrative) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Cumulative net loss   $ 129,783   $ 119,522
Net cash used in operations   9,145 $ 5,406 7,800
Secured convertible notes   17,613   21,280
Proceeds from issuance of Paycheck Protection Program loan   $ 896 900
Sale of stock, number of shares issued   2,127,660    
Proceeds from issuance of stock   $ 46,800    
The 2010 Secured Notes [Member]        
Repayment of secured notes $ 3,700      
Security Purchase Agreement | The "2020 Convertible Noteholders"        
Secured convertible notes   $ 17,500   $ 17,500
Term of debt       5 years
Proceeds from Debt, Net of Issuance Costs       $ 16,800
Security Purchase Agreement | The "2020 Secured Notes"        
Secured convertible notes       $ 7,500
Sale of stock, additional information       The SPA also gave the Company the right, but not the obligation, to request one of the 2020 Convertible Noteholders to purchase an additional $5.0 million in principal amount of a note (the “Second Closing Note”, and, together with the First Closing Note, the “2020 Secured Notes”).