Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 23,982	$ 13,219
Short-term investments	58,181	39,924
Prepaid expenses and other current assets	3,011	2,288
Total current assets	85,174	55,431
Property and equipment, net	239	93
Other assets	15	15
Total assets	85,428	55,539
Current liabilities:
Accounts payable	2,766	1,873
Accrued expenses	2,813	2,010
Current portion of long-term notes payable	1,666
Total current liabilities	7,245	3,883
Long-term notes payable	8,275	9,681
Other non-current liabilities	54	127
Total liabilities	15,574	13,691
Commitments and contingencies
Stockholders' equity:
Common stock, $0.0001 par value; 200,000,000 shares authorized as of December 31, 2020 and 2019; 24,753,102 and 17,425,654 shares issued and outstanding as of December 31, 2020 and 2019, respectively	2	1
Additional paid-in capital	141,074	82,938
Accumulated other comprehensive (loss) income	(297)	21
Accumulated deficit	(70,925)	(41,112)
Total stockholders' equity	69,854	41,848
Total liabilities and stockholders' equity	$ 85,428	$ 55,539