Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 69,046	$ 74,593
Prepaid expenses and other current assets	1,027	1,324
Total current assets	70,073	75,917
Property and equipment, net	3,853	2,165
Operating lease right-of-use assets	1,834	2,301
Restricted cash	329	329
Other assets	243	118
Total assets	76,332	80,830
Current liabilities:
Accounts payable	1,899	922
Accrued expenses and other current liabilities	2,976	2,977
Operating lease liabilities	1,029	985
Total current liabilities	5,904	4,884
Operating lease liabilities, net of current portion	929	1,454
Deferred revenue	12,000
Total liabilities	18,833	6,338
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.001 par value; 200,000,000 shares authorized at June 30, 2021 and December 31, 2020; 13,001,105 and 12,932,377 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	13	13
Additional paid-in capital	226,211	224,363
Accumulated deficit	(168,725)	(149,884)
Total stockholders’ equity	57,499	74,492
Total liabilities and stockholders’ equity	$ 76,332	$ 80,830