Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 36,276	$ 39,766
Prepaid expenses and other current assets	4,831	3,128
Total current assets	41,107	42,894
Property and equipment, net	1,386	1,531
Restricted cash	100	100
Total assets	42,593	44,525
Current liabilities:
Current portion of long-term debt	366	366
Equipment loan payable	78	113
Accounts payable	2,958	1,187
Accrued expenses and other current liabilities	1,169	1,372
Total current liabilities	4,571	3,038
Long-term debt, net of current portion	134	134
Deferred rent	5	8
Total liabilities	4,710	3,180
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock, $0.0001 par value; 200,000,000 shares authorized at March 31, 2021 and December 31, 2020; 10,660,181 shares issued and outstanding at March 31, 2021; 10,634,245 shares issued and outstanding at December 31, 2020	1	1
Additional paid-in capital	96,174	95,738
Accumulated deficit	(58,292)	(54,394)
Total stockholders' equity	37,883	41,345
Total liabilities and stockholders' equity	$ 42,593	$ 44,525