Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 29,113	$ 36,830
Prepaid expenses	477	886
Other current assets	249	241
Total current assets	29,839	37,957
Other non-current assets	398	334
Operating lease right-of-use asset	107	131
Property, equipment and leasehold improvements, net	42	53
Total assets	30,386	38,475
Current liabilities:
Accounts payable	1,738	2,849
Accrued expenses	3,881	3,808
Term loan	7,000	5,833
Term loan derivative liability	125	114
Operating lease liability	123	120
Total current liabilities	12,867	12,724
Term loan	7,056	8,652
Operating lease liability		24
Total liabilities	19,923	21,400
Commitments and contingencies (Note 10)
Stockholders’ equity:
Preferred stock: $0.001 par value; 5,000,000 shares authorized at March 31, 2022 and December 31, 2021; no shares issued or outstanding at March 31, 2022 and December 31, 2021.
Common stock: $0.001 par value; 200,000,000 shares authorized at March 31, 2022 and December 31, 2021; and 30,805,804 and 28,505,804 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively.	31	29
Additional paid-in capital	198,678	197,963
Accumulated deficit	(188,246)	(180,917)
Total stockholders’ equity	10,463	17,075
Total liabilities and stockholders’ equity	$ 30,386	$ 38,475