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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (7,016) $ (8,568)
Adjustment to reconcile net loss to net cash used in operating activities:    
Non-cash stock-based compensation 448 291
Change in operating lease right of use assets 0 24
Change in fair value of common stock warrants 59 (19)
Change in fair value of contingent consideration 263 281
Changes in operating assets and liabilities:    
Contract asset 1,128 0
Prepaid expenses and other assets (1,932) (1,383)
Accounts payable (2,381) (1,476)
Accrued expenses and other current liabilities (136) 638
Deferred revenue (5,600) 0
Net cash used in operating activities (15,167) (10,212)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 6,765 5,963
Collection of stock subscription receivable 0 308
Net proceeds from exercise of warrants 3,017 4
Net cash provided by financing activities 9,782 6,275
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents (5,385) (3,937)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the beginning of period 35,402 7,377
Cash, cash equivalents, restricted cash, and restricted cash equivalents at the end of period 30,017 3,440
Supplemental disclosure of cash flow information:    
Cash received during the period for interest 4 25
Supplemental disclosure of non-cash investing and financing activities:    
Stock subscription receivable 2,240 0
Operating right of use asset and current and non-current lease liability 0 976
Offering expenses in accounts payable and accrued expenses and other current liabilities $ 0 $ 25