CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 41,611	$ 60,816
Short-term investments, available-for-sale	175,346	177,272
Prepaid expenses and other current assets	6,261	7,692
Total current assets	223,218	245,780
Restricted cash	2,098	2,098
Property and equipment, net	14,053	12,856
Operating lease right-of-use assets	65,469	11,678
Other long-term assets	1,461	1,491
Total assets	306,299	273,903
Current liabilities
Accounts payable	2,016	1,112
Operating lease liabilities, current portion	2,505	2,484
Accrued and other current liabilities	6,321	9,347
Total current liabilities	10,842	12,943
Operating lease liabilities, net of current portion	66,740	9,975
Other long-term liabilities	11	18
Total liabilities	77,593	22,936
Commitments and contingencies (Note 7)
Stockholders’ equity
Common stock	3	3
Additional paid-in capital	459,392	455,210
Accumulated other comprehensive loss	(606)	150
Accumulated deficit	(230,083)	(204,096)
Total stockholders’ equity	228,706	250,967
Total liabilities and stockholders’ equity	$ 306,299	$ 273,903