CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 46,718	$ 13,453
Marketable securities	110,794	153,582
Accounts receivable, net - related party	8,003
Inventory, net	3,460	2,584
Income tax receivable	697	697
Other receivables	468	455
Prepaid expenses	6,026	2,519
Total current assets	176,166	173,290
Operating lease right-of-use assets	2,278	2,973
Marketable securities, non-current	47,171	69,754
Property and equipment, net	549	631
Restricted cash	408	408
Total assets	226,572	247,056
Current liabilities:
Accounts payable and accrued expenses	19,332	15,861
Operating lease liabilities, current	1,835	1,755
Total current liabilities	21,167	17,616
Operating lease liabilities, non-current	983	1,918
Commitments and contingencies (Note 16)
Stockholders' equity:
Preferred stock; $0.001 par value; 5,000,000 shares authorized at June 30, 2022 and December 31, 2021, zero shares issued and outstanding at June 30, 2022 and December 31, 2021
Common stock; $0.001 par value; 100,000,000 shares authorized at June 30, 2022 and December 31, 2021, 53,710,300 shares and 53,480,812 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	53	53
Additional paid-in capital	719,129	708,585
Accumulated deficit	(512,713)	(480,758)
Accumulated other comprehensive loss	(2,047)	(358)
Total stockholders' equity	204,422	227,522
Total liabilities and stockholders' equity	$ 226,572	$ 247,056