Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 33,313	$ 35,412
Marketable securities	161,799	182,750
Accounts receivable	0	2,500
Unbilled accounts receivable	802	1,137
Prepaid expenses and other current assets	4,150	4,199
Total current assets	200,064	225,998
Property and equipment, net	7,888	7,368
Operating lease right-of-use assets	10,388	0
Restricted cash	1,092	1,092
Other assets	816	542
Total assets	220,248	235,000
Current liabilities:
Accounts payable	6,003	4,788
Accrued expenses and other current liabilities	6,939	9,231
Deferred revenue, current portion	2,920	4,711
Operating Lease Liability, current	2,426	0
Deferred lease incentive, current portion	0	469
Total current liabilities	18,288	19,199
Operating lease liability, excluding current portion	12,800	0
Deferred lease incentive, excluding current portion	0	2,582
Deferred revenue, excluding current portion	0	1,680
Total liabilities	31,088	23,461
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized; 40,684,025 and 40,636,398 shares issued as of March 31, 2022 and December 31, 2021, respectively; 40,683,605 and 40,626,224 shares outstanding as of March 31, 2022 and December 31, 2021, respectively	41	41
Treasury stock, at cost; no shares as of March 31, 2022 and December 31, 2021	0	0
Additional paid-in capital	518,604	514,362
Accumulated other comprehensive loss	(1,090)	(397)
Accumulated deficit	(328,395)	(302,467)
Total stockholders’ equity	189,160	211,539
Total liabilities and stockholders’ equity	$ 220,248	$ 235,000