Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 28,698	$ 25,229
Short-term investments	13,240	26,494
Accounts receivable	1,500	5,761
Unbilled receivable from government contracts	14,622	6,208
Prepaid expenses and other current assets	4,585	4,568
Total current assets	62,645	68,260
Property and equipment, net	7,821	8,705
Prepaid clinical services, long-term	60,116	60,116
Right-of-use assets, net	19,255	20,404
Intangible assets, net	3,375	3,557
Goodwill	4,508	4,508
Other long-term assets	839	839
Total assets	158,559	166,389
Current liabilities:
Accounts payable	16,617	6,963
Other accrued current liabilities	9,955	11,378
Current portion of operating lease liability	3,257	3,077
Current portion of liability related to sale of future royalties	3,322	4,060
Total current liabilities	98,504	90,878
Operating lease liability, net of current portion	13,570	14,449
Liability related to sale of future royalties, net of current portion	412	1,698
Other long-term liabilities	455	439
Total liabilities	112,941	107,464
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock: $0.0001 par value; 5,000,000 shares authorized; none issued and outstanding as of March 31, 2025 and December 31, 2024	0	0
Common stock: $0.0001 par value; 350,000,000 shares authorized as of March 31, 2025 and December 31, 2024; 228,925,729 shares issued and 228,222,953 shares outstanding as of March 31, 2025 and 228,203,822 shares issued and 227,774,275 shares outstanding as of December 31, 2024	23	23
Additional paid-in capital	538,232	535,770
Treasury stock at cost, 702,776 shares as of March 31, 2025 and 429,547 shares as of December 31, 2024	(517)	(350)
Accumulated deficit	(492,113)	(476,522)
Accumulated other comprehensive income (loss)	(7)	4
Total stockholders’ equity	45,618	58,925
Total liabilities and stockholders’ equity	158,559	166,389
Government Contract [Member]
Current liabilities:
Deferred government revenue	$ 65,353	$ 65,400