Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 97,068	$ 104,055
Prepaid expenses and other current assets	5,647	2,415
Total current assets	102,715	106,470
Property and equipment, net	88	52
Operating lease right-of-use assets	867	318
Other assets	557	647
TOTAL ASSETS	104,227	107,487
CURRENT LIABILITIES:
Accrued and other liabilities	7,781	7,148
Accounts payable	846	2,205
Total current liabilities	8,627	9,353
Operating lease liabilities	543	175
TOTAL LIABILITIES	9,170	9,528
Commitments and Contingencies (Note 7)
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.001 par value; 10,000,000 shares authorized as of September 30, 2021 and December 31, 2020; nil shares issued and outstanding as of September 30, 2021 and December 31, 2020
Common stock, $0.001 par value; 500,000,000 shares authorized as of September 30, 2021 and December 31, 2020; 14,498,953 and 11,128,484 shares issued and outstanding as of September 30, 2021 and December 31, 2020	14	11
Additional paid-in capital	1,010,824	944,537
Accumulated deficit	(915,781)	(846,589)
TOTAL STOCKHOLDERS’ EQUITY	95,057	97,959
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 104,227	$ 107,487