Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash, cash equivalents and restricted cash	$ 46,013	$ 143,745
Short-term investments	49,704	22,742
Accounts receivable	20	71
Prepaid expenses and other current assets	3,714	2,609
Total current assets	99,451	169,167
Long-term investments	0	16,210
Property and equipment, net	15,585	6,601
Right-of-use assets, net	25,715	13,168
Intangible assets, net	5,020	10,624
Goodwill	4,508	4,508
Other long-term assets	3,568	890
Total assets	153,847	221,168
Current liabilities:
Accounts payable	5,514	3,872
Deferred grant revenue	2,000	0
Other accrued current liabilities	8,084	5,064
Current portion of operating lease liability	2,228	1,011
Current portion of liability related to sale of future royalties	95	836
Total current liabilities	17,921	10,783
Operating lease liability, net of current portion	19,477	11,997
Liability related to sale of future royalties, net of current portion	5,621	10,686
Other long-term liabilities	231	171
Total liabilities	43,250	33,637
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred Stock: $0.0001 par value; 5,000,000 shares authorized; none issued and outstanding as of December 31, 2022 or 2021	0	0
Common Stock: $0.0001 par value; 250,000,000 and 150,000,000 shares authorized as of December 31, 2022 and 2021, respectively; 134,199,429 and 125,594,393 shares issued and outstanding as of December 31, 2022 and 2021, respectively	13	13
Additional paid-in capital	437,992	406,943
Accumulated deficit	(327,109)	(219,351)
Accumulated other comprehensive loss	(299)	(74)
Total stockholders’ equity	110,597	187,531
Total liabilities and stockholders’ equity	$ 153,847	$ 221,168