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
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Cumulative net loss $ 125,803   $ 119,522
Net cash used in operations 5,849 $ 4,039 7,800
Secured convertible notes 17,504   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    
Security Purchase Agreement | The "2020 Convertible Noteholders"      
Secured convertible notes $ 17,500   17,500
Proceeds from debt, net     $ 16,800
Term of secured notes     5 years
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”).