Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 201,741	$ 68,985
Short-term investments	132,900	176,985
Prepaid expenses and other current assets	7,582	10,378
Total current assets	342,223	256,348
Property and equipment, net	10,138	7,954
Operating lease right-of-use assets	26,121	27,958
Long-term investments	17,697	27,117
Restricted cash	871	871
Other assets	5,667	4,089
Total noncurrent assets	60,494	67,989
Total assets	402,717	324,337
Current liabilities:
Accounts payable	4,801	6,758
Accrued compensation	1,270	3,455
Accrued manufacturing expenses	6,856	4,440
Accrued expenses	7,744	8,787
Operating lease liabilities — current	6,578	5,276
Total current liabilities	27,249	28,716
Operating lease liabilities — long-term	15,832	11,507
Other liabilities	93	96
Total liabilities	43,174	40,319
Commitments and contingencies (Note 6)
Stockholders' Equity
Preferred stock, $0.001 par value 10,000,000 shares authorized at March 31, 2022 and December 31, 2021; no shares issued and outstanding at March 31, 2022 and December 31, 2021	0	0
Common stock, $0.001 par value 500,000,000 shares authorized at March 31, 2022 and December 31, 2021; 56,499,544 and 53,031,978 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	59	56
Additional paid-in capital	697,944	582,844
Accumulated other comprehensive loss	(833)	(241)
Accumulated deficit	(337,627)	(298,641)
Total stockholders' equity	359,543	284,018
Total liabilities and stockholders' equity	$ 402,717	$ 324,337