Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 66,105	$ 74,593
Prepaid expenses and other current assets	1,246	1,324
Total current assets	67,351	75,917
Property and equipment, net	3,168	2,165
Operating lease right-of-use assets	2,069	2,301
Restricted cash	329	329
Other assets		118
Total assets	72,917	80,830
Current liabilities:
Accounts payable	1,169	922
Accrued expenses and other current liabilities	1,994	2,977
Operating lease liabilities	1,007	985
Total current liabilities	4,170	4,884
Operating lease liabilities, net of current portion	1,196	1,454
Total liabilities	5,366	6,338
Commitments and contingencies (Note 9)
Stockholders’ equity:
Common stock, $0.001 par value; 200,000,000 shares authorized at March 31, 2021 and December 31, 2020; 12,962,768 and 12,932,377 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	13	13
Additional paid-in capital	225,224	224,363
Accumulated deficit	(157,686)	(149,884)
Total stockholders’ equity	67,551	74,492
Total liabilities and stockholders’ equity	$ 72,917	$ 80,830