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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Operating activities:    
Net (loss) income $ (23,171) $ 6,154
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Share-based compensation expense 1,893 3,305
Depreciation and amortization 344 326
Accretion of discounts on available-for-sale investments (537) (99)
Loss on disposal of property and equipment 34 0
Change in operating assets and liabilities:    
Accounts receivable, net 789 0
Prepaid expenses and other assets (3,524) 1,251
Contract assets 0 (3,930)
Other non-current assets (7) (67)
Accounts payable 1,952 (1,679)
Accrued liabilities 131 (579)
Contract liabilities 0 (12,951)
Operating lease liabilities 56 (6)
Other non-current liabilities (510) (11)
Net cash used in operating activities (22,550) (8,286)
Investing activities:    
Purchases of short-term investments (30,470) 0
Proceeds from maturities and sales of short-term investments 15,340 12,750
Purchases of property and equipment (384) (290)
Proceeds from sale of property and equipment 2 0
Net cash (used in) provided by investing activities (15,512) 12,460
Financing activities:    
Proceeds from purchases under the ESPP 143 20
Proceeds from exercise of stock options 20 101
Net cash provided by financing activities 163 121
Effect of exchange rate changes on cash and cash equivalents 299 (119)
Net (decrease) increase in cash and cash equivalents (37,600) 4,176
Cash and cash equivalents at beginning of year 78,232 105,663
Cash and cash equivalents at end of year 40,632 109,839
Supplemental disclosure of cash flow information:    
Income taxes paid $ 124 $ 0