Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 11,288	$ 8,305
Marketable securities, available for-sale	62,508	82,575
Prepaid expenses and other current assets	3,563	1,266
Total current assets	77,359	92,146
Property, plant and equipment-net	224	707
Other asset	27	26
Total assets	77,610	92,879
Current liabilities:
Accounts payable	9,803	12,908
Accrued liabilities	5,704	3,703
Total current liabilities	15,507	16,611
Total liabilities	15,507	16,611
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.01 par value; 10,000,000 shares authorized, no shares issued and outstanding as of March 31, 2022 and December 31, 2021	0	0
Common stock, $0.01 par value; 200,000,000 shares authorized, 40,254,890 shares issued and outstanding as of March 31, 2022 and December 31, 2021	403	403
Additional paid-in-capital	171,182	170,241
Accumulated other comprehensive income	(467)	(225)
Accumulated deficit	(109,015)	(94,151)
Total stockholders' equity	62,103	76,268
Total liabilities and stockholders' equity	$ 77,610	$ 92,879