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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Operating activities:    
Net loss $ (14,393) $ (2,266)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation 65 67
Stock-based compensation 1,184 1,924
Net unrealized (gain) loss on foreign currency transactions (419) 159
Amortization of investments, net (14) (519)
Deferred revenue   (7,298)
Changes in operating assets and liabilities:    
Accounts receivable   (2,159)
Prepaid expenses and other current assets 1,576 2,008
Accounts payable 2,126 (203)
Accrued expenses (1,301) 228
Right-of-use assets and lease liabilities, net (6) (11)
Net cash used in operating activities (11,182) (8,070)
Investing activities:    
Purchases of property and equipment (4) (81)
Purchases of short-term investments   (17,601)
Maturities of short-term investments 4,500 13,500
Net cash provided by (used in) investing activities 4,496 (4,182)
Financing activities:    
Proceeds from exercise of stock options 38  
Net cash provided by financing activities 75 91
Effect of exchange rate changes on cash and cash equivalents 21 2
Net decrease in cash and cash equivalents (6,590) (12,159)
Cash and cash equivalents at beginning of period 18,085 23,216
Cash and cash equivalents at end of period 11,495 11,057
Supplemental cash flow information:    
ATM facility issuance costs reclassed from other current assets 392  
ATM facility issuance costs in accrued expenses 83  
ATM facility    
Financing activities:    
Proceeds from issuance of common stock under ATM facility, net of issuance costs $ 37 $ 91