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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities    
Net loss $ (13,787) $ (34,638)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 2,067 2,364
Depreciation and amortization 28 83
Amortization/accretion on short-term investments (1,644) (2,011)
Changes in the fair value of performance award 1 847
Non-cash lease expense 129 241
Loss on disposal of fixed asset 27 3
Changes in operating assets and liabilities:    
Prepaid and other assets 2,360 1,542
Accounts payable and accrued expenses (16,829) 6,690
Operating lease liabilities (173) (283)
Net cash used in operating activities (27,821) (25,162)
Cash flows from investing activities    
Purchases of property and equipment (2) (177)
Purchase of available-for-sale short-term investments (67,750) (132,327)
Proceeds from maturities of available-for-sale short-term investments 104,000 82,000
Net cash provided by (used in) investing activities 36,248 (50,504)
Cash flows from financing activities    
Payments of deferred costs in connection with private placement transaction (89)  
Proceeds from private placement of common stock, net of offering costs   4,667
Proceeds from issuance of common stock in connection with equity plans   282
Net cash (used in) provided by financing activities (89) 64,820
Net increase (decrease) in cash and cash equivalents 8,338 (10,846)
Cash and cash equivalents, beginning of period 27,632 19,927
Cash and cash equivalents, end of period $ 35,970 9,081
Supplemental cash flow information:    
Property and equipment in accounts payable   10
Public Offering [Member]    
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs   58,862
At-The-Market Facility [Member]    
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs   $ 1,009