Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 26,735	$ 34,755
Short-term investments	9,929	4,958
Accounts receivable	556	3,008
Prepaid expenses and other current assets	7,064	2,815
Total current assets	44,284	45,536
Property and equipment, net	11,102	11,731
Right-of-use assets, net	23,753	24,840
Intangible assets, net	4,106	4,289
Goodwill	4,508	4,508
Other long-term assets	917	926
Total assets	88,670	91,830
Current liabilities:
Accounts payable	3,978	1,584
Other accrued current liabilities	4,980	5,634
Current portion of operating lease liability	2,799	2,703
Current portion of liability related to sale of future royalties	2,360	3,803
Total current liabilities	14,117	13,724
Operating lease liability, net of current portion	16,691	17,385
Liability related to sale of future royalties, net of current portion	1,863	2,623
Other long-term liabilities	309	293
Total liabilities	32,980	34,025
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock: $0.0001 par value; 5,000,000 shares authorized; none issued and outstanding as of March 31, 2024 and December 31, 2023	0	0
Common stock: $0.0001 par value; 250,000,000 shares authorized as of March 31, 2024 and December 31, 2023; 177,187,965 shares issued and 176,523,042 shares outstanding as of March 31, 2024 and 153,959,853 shares issued and 153,452,833 shares outstanding as of December 31, 2023	18	15
Additional paid-in capital	490,221	467,731
Treasury stock at cost, 664,923 shares as of March 31, 2024 and 507,020 shares as of December 31, 2023	(548)	(366)
Accumulated deficit	(433,991)	(409,574)
Accumulated other comprehensive loss	(10)	(1)
Total stockholders’ equity	55,690	57,805
Total liabilities and stockholders’ equity	$ 88,670	$ 91,830