Annual report pursuant to Section 13 and 15(d)

Organization (Details)

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Organization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accumulated deficit $ 208,867 $ 199,103
Cash used in operating activities 11,156 8,755
Cash and cash equivalents, at carrying value 40,406 $ 12,862
Debt covenant, unrestricted cash 2,000  
Unrestricted cash $ 38,406