CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 41,178	$ 74,268
Restricted cash		182
Short-term investments	14,673	1,010
Prepaid expenses	1,673	2,791
Other current assets	331	24
Total current assets	57,855	78,275
Restricted cash	182
Property and equipment, net	57	69
Right-of-use lease assets - operating, net	785	410
Deposits and other assets	283	283
Total assets	59,162	79,037
Current liabilities
Accounts payable	982	544
Accrued expenses	4,126	3,995
Term loan, short-term	9,851	9,805
Lease obligation - operating, short-term	553	476
Other current liabilities	28	26
Total current liabilities	15,540	14,846
Term loan, long-term	2,463	7,354
Lease obligation - operating, long-term	271
Other liabilities	431	367
Total liabilities	18,705	22,567
Commitments and contingencies (Note 11)
Stockholders’ equity
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued and outstanding
Common stock, $0.0001 par value; 150,000,000 shares authorized as of June 30, 2022; 27,366,707 and 27,395,146 shares issued and outstanding as of December 31, 2021 and June 30, 2022, respectively	3	3
Additional paid-in capital	247,587	246,166
Accumulated deficit	(207,126)	(189,698)
Accumulated other comprehensive loss	(7)	(1)
Total stockholders’ equity	40,457	56,470
Total liabilities and stockholders’ equity	$ 59,162	$ 79,037