CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 305,730	$ 212,835
Marketable securities	64,958	40,159
Prepaid expenses and other current assets	18,451	12,325
Total current assets	389,139	265,319
Property and equipment, net	8,747	9,564
Operating lease right-of-use asset	22,060	25,442
Restricted cash	2,498	2,498
Other long-term assets	1,684	1,622
Total assets	424,128	304,445
Current liabilities:
Accounts payable	2,851	4,434
Accrued expenses	17,894	17,456
Operating lease liability	7,840	7,407
Short-term debt	11,577	1,577
Deferred revenue		33,193
Other current liabilities		230
Total current liabilities	40,162	64,297
Long-term portion of operating lease liability	15,648	19,652
Long-term debt	38,811	48,422
Total liabilities	94,621	132,371
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, $0.001 par value; 10,000,000 shares authorized at June 30, 2022 and December 31, 2021; no shares issued and outstanding at June 30, 2022 and December 31, 2021
Common stock, $0.001 par value; 150,000,000 shares authorized; 51,638,247 and 35,209,099 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively	52	35
Additional paid-in capital	757,614	548,204
Accumulated other comprehensive loss	(79)	(35)
Accumulated deficit	(428,080)	(376,130)
Total stockholders' equity	329,507	172,074
Total liabilities and stockholders' equity	$ 424,128	$ 304,445