Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 104,749	$ 104,055
Prepaid expenses and other current assets	2,644	2,415
Total current assets	107,393	106,470
Property and equipment, net	141	52
Operating lease right-of-use assets	788	318
Other assets	1,045	647
TOTAL ASSETS	109,367	107,487
CURRENT LIABILITIES:
Accrued and other liabilities	10,726	7,148
Accounts payable	2,158	2,205
Total current liabilities	12,884	9,353
Operating lease liabilities	485	175
TOTAL LIABILITIES	13,369	9,528
Commitments and Contingencies (Note 7)
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.001 par value; 10,000,000 shares authorized as of December 31, 2021 and December 31, 2020; nil shares issued and outstanding as of December 31, 2021 and December 31, 2020
Common stock, $0.001 par value; 500,000,000 shares authorized as of December 31, 2021 and December 31, 2020; 15,571,656 and 11,128,484 shares issued and outstanding as of December 31, 2021 and 2020	16	11
Additional paid-in capital	1,037,230	944,537
Accumulated deficit	(941,248)	(846,589)
TOTAL STOCKHOLDERS’ EQUITY	95,998	97,959
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 109,367	$ 107,487