Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 70,097	$ 68,148
Marketable debt securities		24,490
Prepaid expenses and other current assets	2,107	5,314
Total current assets	72,204	97,952
Property and equipment, net	1,049	1,040
Operating lease right-of-use assets	3,406	3,936
Restricted cash	1,339	1,339
Other assets	669	419
Total assets	78,667	104,686
Current liabilities:
Accounts payable	1,660	2,634
Accrued expenses	6,592	5,843
Operating lease liabilities, current	594	515
Total current liabilities	8,846	8,992
Operating lease liabilities	5,408	6,002
Total liabilities	14,254	14,994
Commitments and contingencies (See Note 9)
Stockholders’ equity:
Preferred stock; $0.001 par value per share; 5,000,000 shares authorized as of December 31, 2021 and December 31, 2020; no shares issued and outstanding as of December 31, 2021 and December 31, 2020
Common stock, $0.001 par value per share; 115,000,000 shares authorized as of December 31, 2021 and December 31, 2020; 17,710,450 and 15,367,730 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively	18	15
Additional paid-in capital	180,645	155,290
Accumulated deficit	(116,250)	(65,614)
Accumulated other comprehensive gain		1
Total stockholders' equity	64,413	89,692	$ (694)
Total liabilities and stockholders' equity	$ 78,667	$ 104,686