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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net loss $ (9,924) $ (12,773)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 42 104
Stock-based compensation 903 2,062
Commitment shares issued to Lincoln Park Capital, LLC 249 0
Loss on shares sold to Lincoln Park Capital, LLC 11 0
Amortization of right-of-use asset 83 186
Impairment of right-of-use asset 0 772
Non-cash component of acquisition of Exacis in-process research and development 433 0
Impairment of in-process research and development 0 5,990
Loss on disposal of fixed assets 1 274
Gain on lease termination 0 (85)
Change in fair value of warrant liabilities (146) (9,470)
Change in fair value of contingent consideration liability (118) 0
Loss on non-controlling investment 59 911
Changes in operating assets and liabilities:    
Other receivables (33) (5)
Prepaid expenses and other current assets 214 (727)
Other non-current assets (481) 11
Accounts payable and accrued expenses (454) 2,295
Operating lease liability (215) (153)
Due to related party (875) 0
Deferred revenue 250 0
Other liabilities 80 1,183
Net cash used in operating activities (9,921) (9,425)
Cash flows from investing activities:    
Purchase of property and equipment 0 (233)
Proceeds from the sale of fixed assets 0 100
Net cash used in investing activities 0 (133)
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants in connection with private offering 0 11,993
Proceeds from sale of common stock pursuant to stock purchase agreement with Lincoln Park Capital Fund, LLC 320 0
Payroll tax remitted on net share settlement of equity awards 0 (5)
Dividends paid to Series A preferred stockholders (8) (8)
Net cash provided by financing activities 312 11,980
Net (decrease) increase in cash and cash equivalents (9,609) 2,422
Cash, cash equivalents and restricted cash at beginning of period 15,541 16,985
Cash, cash equivalents and restricted cash at end of period 5,932 19,407
Cash paid during the period for:    
Interest 13 14
Income taxes 4 8
Supplemental disclosure of non-cash investing and financing activities:    
Contingent consideration for Exacis asset acquisition 225 0
Issuance of common stock for Exacis asset acquisition 208 0
Initial measurement of right-of-use asset 34,410 1,706
Initial measurement of lease liability 34,169 1,706
Reconciliation of cash, cash equivalents and restricted cash at end of period:    
Cash and cash equivalents 1,837 19,407
Restricted cash 4,095 0
Total cash, cash equivalents and restricted cash at end of period $ 5,932 $ 19,407