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UNAUDITED 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 $ (10,171) $ (15,818)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 479 593
Equity-based compensation 1,277 849
Amortization of long-term debt issuance costs and fees 0 477
Amortization of right-of-use asset 364 341
Amortization of investments 0 (2)
Other 44 18
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 145 1,999
Other noncurrent assets 288 24
Accounts payable (18) (1,820)
Accrued expenses (190) (3,156)
Deferred revenue 0 (5,036)
Other liabilities (347) (303)
Net cash used in operating activities (8,129) (21,834)
Cash flows from investing activities:    
Purchase of available-for-sale securities (2,000) (1,499)
Proceeds from sale or maturity of available-for-sale securities 0 5,000
Capital expenditures 0 (10)
Proceeds from sale of capital assets 211 0
Net cash (used in) provided by investing activities (1,789) 3,491
Cash flows from financing activities:    
Repayment of long-term debt 0 (7,500)
Payment of long-term debt fees and issuance costs 0 (506)
Proceeds from common stock offering 5,440 5,054
Payment of common stock financing costs (843) (154)
Payment of exercise of common stock warrants (800) 0
Proceeds from issuance of employee stock purchase plan 0 4
Proceeds from exercise of common stock warrants 0 1
Payments for minimum statutory tax withholding related to net share settlement of equity awards (121) (2)
Net cash provided by (used in) provided by financing activities 3,676 (3,103)
Net (decrease) in cash, cash equivalents, and restricted cash (6,242) (21,446)
Cash, cash equivalents, and restricted cash - beginning of period 9,777 43,844
Cash, cash equivalents, and restricted cash - end of period $ 3,535 $ 22,398