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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities    
Net loss $ (8,426) $ (15,107)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 1,078 1,157
Depreciation and amortization 16 41
Amortization/accretion on short-term investments (906) (770)
Changes in the fair value of performance award   295
Non-cash lease expense 67 120
Loss on disposal of fixed asset 16 3
Changes in operating assets and liabilities:    
Prepaid and other assets 2,584 1,952
Accounts payable and accrued expenses (15,363) 3,398
Operating lease liabilities (80) (137)
Net cash used in operating activities (21,014) (9,048)
Cash flows from investing activities    
Purchases of property and equipment   (172)
Purchase of available-for-sale short-term investments (45,243) (28,321)
Proceeds from maturities of available-for-sale short-term investments 59,000 47,000
Net cash provided by investing activities 13,757 18,507
Cash flows from financing activities    
Proceeds from issuance of common stock under the at-the-market facility, net of offering costs   1,009
Net cash provided by financing activities   1,009
Net (decrease) increase in cash and cash equivalents (7,257) 10,468
Cash and cash equivalents, beginning of period 27,632 19,927
Cash and cash equivalents, end of period $ 20,375 $ 30,395