Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 143,745	$ 126,870
Short-term investments	22,742	0
Accounts receivable	71	334
Prepaid expenses and other current assets	2,609	1,327
Total current assets	169,167	128,531
Long-term investments	16,210	0
Property and equipment, net	6,601	1,480
Right-of-use assets, net	13,168	6,838
Intangible assets, net	10,624	15,361
Goodwill	4,508	0
Other long-term assets	890	372
Total assets	221,168	152,582
Current liabilities:
Accounts payable	3,872	2,133
Current portion of operating lease liability	1,011	2,052
Current portion of liability related to sale of future royalties	836	2,779
Other accrued current liabilities	5,064	4,799
Total current liabilities	10,783	11,763
Operating lease liability, net of current portion	11,997	5,156
Liability related to sale of future royalties, net of current portion	10,686	12,150
Other long-term liabilities	171	109
Total liabilities	33,637	29,178
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred Stock: $0.0001 par value; 5,000,000 shares authorized; none issued and outstanding as of December 31, 2021 or 2020	0	0
Common Stock: $0.0001 par value; 150,000,000 shares authorized; 125,594,393 and 110,271,093 shares issued and outstanding as of December 31, 2021 and 2020, respectively	13	11
Additional paid-in capital	406,943	272,274
Accumulated deficit	(219,351)	(148,881)
Accumulated other comprehensive loss	(74)	0
Total stockholders’ equity	187,531	123,404
Total liabilities and stockholders’ equity	$ 221,168	$ 152,582