CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 47,391	$ 63,741
Marketable securities	66,892	81,658
Accounts receivable, net - related party	6,066	3,260
Inventory, net	3,515	2,383
Income tax receivable	697	697
Other receivables	495	496
Prepaid expenses	17,195	16,267
Restricted cash	408	408
Total current assets	142,659	168,910
Operating lease right-of-use assets	1,175	1,551
Marketable securities, non-current	9,074	11,350
Property and equipment, net	368	426
Total assets	153,276	182,237
Current liabilities:
Accounts payable and accrued expenses	15,222	21,540
Operating lease liabilities, current	1,456	1,918
Total current liabilities	16,678	23,458
Commitments and contingencies (Note 16)
Stockholders' equity:
Preferred stock; $0.001 par value; 5,000,000 shares authorized at March 31, 2023 and December 31, 2022, zero shares issued and outstanding at March 31, 2023 and December 31, 2022
Common stock; $0.001 par value; 100,000,000 shares authorized at March 31, 2023 and December 31, 2022, 53,974,352 shares and 53,797,341 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	54	53
Additional paid-in capital	730,542	726,630
Accumulated deficit	(592,897)	(566,232)
Accumulated other comprehensive loss	(1,101)	(1,672)
Total stockholders' equity	136,598	158,779
Total liabilities and stockholders' equity	$ 153,276	$ 182,237