Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 58,131	$ 74,593
Prepaid expenses and other current assets	2,755	1,324
Total current assets	60,886	75,917
Property and equipment, net	4,706	2,165
Operating lease right-of-use assets	1,596	2,301
Restricted cash	329	329
Other assets	245	118
Total assets	67,762	80,830
Current liabilities:
Accounts payable	2,912	922
Accrued expenses and other current liabilities	3,968	2,977
Operating lease liabilities	1,052	985
Deferred revenue	9,841
Total current liabilities	17,773	4,884
Operating lease liabilities, net of current portion	656	1,454
Deferred revenue, net of current portion	2,145
Total liabilities	20,574	6,338
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.001 par value; 200,000,000 shares authorized at September 30, 2021 and December 31, 2020; 13,004,578 and 12,932,377 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	13	13
Additional paid-in capital	226,955	224,363
Accumulated deficit	(179,780)	(149,884)
Total stockholders’ equity	47,188	74,492
Total liabilities and stockholders’ equity	$ 67,762	$ 80,830