CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 42,806	$ 13,453
Marketable securities	112,806	153,582
Accounts receivable, net - related party	9,623
Inventory, net	1,835	2,584
Income tax receivable	697	697
Other receivables	451	455
Prepaid expenses	18,562	2,519
Total current assets	186,780	173,290
Operating lease right-of-use assets	1,918	2,973
Marketable securities, non-current	23,916	69,754
Property and equipment, net	487	631
Restricted cash	408	408
Total assets	213,509	247,056
Current liabilities:
Accounts payable and accrued expenses	26,316	15,861
Operating lease liabilities, current	1,876	1,755
Total current liabilities	28,192	17,616
Operating lease liabilities, non-current	497	1,918
Commitments and contingencies (Note 16)
Stockholders' equity:
Preferred stock; $0.001 par value; 5,000,000 shares authorized at September 30, 2022 and December 31, 2021, zero shares issued and outstanding at September 30, 2022 and December 31, 2021
Common stock; $0.001 par value; 100,000,000 shares authorized at September 30, 2022 and December 31, 2021, 53,733,607 shares and 53,480,812 shares issued and outstanding at September 30, 2022 and December 31, 2021, respectively	53	53
Additional paid-in capital	722,808	708,585
Accumulated deficit	(535,893)	(480,758)
Accumulated other comprehensive loss	(2,148)	(358)
Total stockholders' equity	184,820	227,522
Total liabilities and stockholders' equity	$ 213,509	$ 247,056