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, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accumulated deficit $ 183,278 $ 171,146
Cash used in operating activities 15,772 22,165
Cash 10,872 $ 7,655
Debt covenant, unrestricted cash 3,564  
Unrestricted cash $ 7,308