CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 76,914	$ 47,976
Marketable securities (Note 4)	315,395	394,442
Contract assets	2,370	135
Prepaid expenses and other current assets	8,091	8,720
Total current assets	402,770	451,273
Marketable securities, non-current (Note 4)	90,182	125,187
Property and equipment, net (Note 6)	12,748	11,881
Right-of-use assets, operating leases	9,181	9,426
Other non-current assets	2,427	2,022
Restricted cash	6,113	6,116
Total assets	523,421	605,905
Current liabilities:
Accounts payable	2,374	4,005
Accrued expenses (Note 8)	21,738	22,971
Deferred revenue	59,460	61,739
Operating lease liabilities	2,498	2,461
Finance lease liabilities	1,158	1,138
Other current liabilities	272	228
Total current liabilities	87,500	92,542
Non-current liabilities
Deferred revenue, net of current portion	24,071	39,295
Operating lease liabilities, net of current portion	12,708	13,224
Finance lease liabilities, net of current portion	927	1,140
Other non-current liabilities	264	66
Total liabilities	125,470	146,267
Stockholders’ equity:
Common stock, $0.0001 par value; 150,000,000 shares authorized as of June 30, 2022 and December 31, 2021, 51,856,668 and 51,573,924 shares issued at June 30, 2022 and December 31, 2021, respectively; 51,847,049 and 51,536,181 shares outstanding at June 30, 2022 and December 31, 2021, respectively	5	5
Additional paid-in capital	707,852	689,275
Accumulated deficit	(305,923)	(228,982)
Accumulated other comprehensive loss	(3,983)	(660)
Total stockholders’ equity	397,951	459,638
Total liabilities and stockholders’ equity	$ 523,421	$ 605,905