CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 51,630	$ 74,268
Restricted cash	182	182
Short-term investments	13,788	1,010
Prepaid expenses	2,567	2,791
Other current assets	59	24
Total current assets	68,226	78,275
Property and equipment, net	66	69
Right-of-use lease assets - operating, net	318	410
Deposits and other assets	283	283
Total assets	68,893	79,037
Current liabilities
Accounts payable	445	544
Accrued expenses	3,477	3,995
Term loan, short-term	9,826	9,805
Lease obligation - operating, short-term	356	476
Other current liabilities	71	26
Total current liabilities	14,175	14,846
Term loan, long-term	4,913	7,354
Lease obligation - operating, long-term	10
Other liabilities	402	367
Total liabilities	19,500	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 March 31, 2022; 27,366,707 and 27,371,488 shares issued and outstanding as of December 31, 2021 and March 31, 2022, respectively	3	3
Additional paid-in capital	246,823	246,166
Accumulated deficit	(197,429)	(189,698)
Accumulated other comprehensive loss	(4)	(1)
Total stockholders’ equity	49,393	56,470
Total liabilities and stockholders’ equity	$ 68,893	$ 79,037