CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 33,733	$ 47,976
Marketable securities (Note 4)	387,079	394,442
Contract assets	1,263	135
Prepaid expenses and other current assets	9,307	8,720
Total current assets	431,382	451,273
Marketable securities, non-current (Note 4)	102,478	125,187
Property and equipment, net (Note 6)	11,759	11,881
Right-of-use assets, operating leases	9,307	9,426
Other non-current assets	2,022	2,022
Restricted cash	6,112	6,116
Total assets	563,060	605,905
Current liabilities:
Accounts payable	2,567	4,005
Accrued expenses (Note 8)	20,777	22,971
Deferred revenue	60,852	61,739
Operating lease liabilities	2,480	2,461
Finance lease liabilities	1,087	1,138
Other current liabilities	576	228
Total current liabilities	88,339	92,542
Non-current liabilities
Deferred revenue, net of current portion	31,823	39,295
Operating lease liabilities, net of current portion	12,978	13,224
Finance lease liabilities, net of current portion	927	1,140
Other non-current liabilities	273	66
Total liabilities	134,340	146,267
Stockholders’ equity:
Common stock, $0.0001 par value; 150,000,000 shares authorized as of March 31, 2022 and December 31, 2021, 51,716,194 and 51,573,924 shares issued at March 31, 2022 and December 31, 2021, respectively; 51,692,666 and 51,536,181 shares outstanding at March 31, 2022 and December 31, 2021, respectively	5	5
Additional paid-in capital	697,597	689,275
Accumulated deficit	(265,666)	(228,982)
Accumulated other comprehensive loss	(3,216)	(660)
Total stockholders’ equity	428,720	459,638
Total liabilities and stockholders’ equity	$ 563,060	$ 605,905