Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 50,366	$ 23,982
Short-term investments	30,345	58,181
Prepaid expenses and other current assets	2,659	3,011
Total current assets	83,370	85,174
Operating lease right-of-use asset	1,645
Property and equipment, net	237	239
Other assets	153	15
Total assets	85,405	85,428
Current liabilities:
Accounts payable	1,225	2,766
Accrued expenses	5,886	2,813
Current portion of long-term notes payable	1,428	1,666
Current portion of operating lease liabilities	376
Total current liabilities	8,915	7,245
Long-term notes payable	8,750	8,275
Long-term operating lease liabilities	1,235
Other non-current liabilities		54
Total liabilities	18,900	15,574
Commitments and contingencies
Stockholders' equity:
Common stock, $0.0001 par value; 200,000,000 shares authorized as of December 31, 2021 and 2020; 29,455,668 and 24,753,102 shares issued and outstanding as of December 31, 2021 and 2020, respectively	2	2
Additional paid-in capital	176,618	141,074
Accumulated other comprehensive (loss) income	(138)	(297)
Accumulated deficit	(109,977)	(70,925)
Total stockholders' equity	66,505	69,854
Total liabilities and stockholders' equity	$ 85,405	$ 85,428