Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 31,340	$ 142,086
Short-term investments	125,201	89,734
Accounts receivable	3,267	0
Inventory	1,513	0
Prepaid expenses and other current assets	5,271	4,530
Total current assets	166,592	236,350
Restricted cash equivalents	100,000	0
Long-term investments	4,983	0
Property and equipment, net	981	1,293
Operating lease right-of-use assets	1,569	1,949
Intangible assets, net	18,740
Other assets	1,786	1,272
Total assets	294,651	240,864
Current liabilities:
Accounts payable	9,166	3,151
Accrued expenses	30,723	13,411
Operating lease liabilities	711	636
Derivative liability	1,996	1,264
Total current liabilities	42,596	18,462
Revenue interest liability, net	129,923	47,651
Operating lease liabilities, noncurrent	1,903	2,627
Other liabilities	17	29
Total liabilities	174,439	68,769
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized as of December 31, 2021 and 2020, respectively; zero shares issued and outstanding as of December 31, 2021 and 2020, respectively; and liquidation value of zero as of December 31, 2021 and 2020, respectively	0	0
Common stock, $0.0001 par value; 200,000,000 shares authorized as of December 31, 2021 and 2020, respectively; 30,705,060 shares issued and 30,582,596 shares outstanding, excluding 122,464 shares subject to repurchase as of December 31, 2021; and 30,032,600 shares issued and 29,776,544 shares outstanding, excluding 256,056 shares subject to repurchase as of December 31, 2020	3	3
Additional paid-in capital	377,403	345,180
Accumulated deficit	(257,159)	(173,171)
Accumulated other comprehensive income	(35)	83
Total stockholders’ equity	120,212	172,095
Total liabilities and stockholders’ equity	$ 294,651	$ 240,864