Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 17,664	$ 49,702
Short-term investments	28,042	0
Prepaid expenses and other current assets	2,633	3,194
Total current assets	48,339	52,896
Property and equipment, net	149	91
Operating lease right-of-use assets	153	166
Other assets	854	903
Total assets	49,495	54,056
Current liabilities:
Accounts payable	294	516
Accrued expenses	2,290	3,418
Lease liabilities, current portion	46	44
Total current liabilities	2,630	3,978
Earn-out liability	1,373	12,130
Non-current term loans, net	18,816	18,760
Accrued final payment on term loans	1,100	1,100
Non-current warrant liability	233	678
Non-current lease liabilities	109	126
Total liabilities	24,261	36,772
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value; 100,000,000 and zero shares authorized at March 31, 2022 and December 31, 2021 respectively; zero shares issued and outstanding as of March 31, 2022 and December 31, 2021	0	0
Common stock, $0.0001 par value; 1,000,000,000 shares authorized at March 31, 2022 and December 31, 2021; 41,395,352 shares issued and 41,095,352 shares issued and outstanding as of March 31, 2022; 40,689,975 shares issued and 40,389,975 shares issued and outstanding as of December 31, 2021	4	4
Additional paid-in capital	143,112	138,181
Accumulated other comprehensive loss	(50)
Accumulated deficit	(117,832)	(120,901)
Total stockholders' equity	25,234	17,284
Total liabilities and stockholders' equity	$ 49,495	$ 54,056