Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net loss	$ (38,646)	$ (16,483)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	3,176	5,377
Depreciation	69	734
Accretion of discounts on marketable securities	(1,564)	(3,004)
Non-cash lease income	(4)	(193)
Loss on sales and disposals of fixed assets, net	38
Other, net	(16)	7
Change in operating assets and liabilities:
Prepaid expenses and other assets	3,167	(1,518)
Operating lease right-of-use assets and liabilities		241
Accounts payable	(3,981)	1,296
Accrued expenses	1,193	(4,239)
Net cash used in operating activities	(36,568)	(17,782)
Cash flows from investing activities:
Purchases of property and equipment	(15)	(598)
Proceeds from sale of property and equipment	30
Purchases of marketable securities	(46,689)	(71,374)
Maturities of marketable securities	86,374	100,461
Net cash provided (used) by investing activities	39,700	28,489
Cash flows from financing activities:
Proceeds from the exercise of stock options and common stock issued under the 2020 EIP	113	141
Net cash provided by financing activities	113	141
Impact of exchange rates on cash, cash equivalents, and restricted cash	6	(28)
Net increase (decrease) in cash and cash equivalents	3,251	10,820
Cash, cash equivalents, and restricted cash
Cash, cash equivalents, and restricted cash - beginning of period	40,876	38,528
Cash, cash equivalents, and restricted cash - end of period	$ 44,127	$ 49,348