Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 46,533	$ 55,070
Receivables	28	28
Prepaid expenses and other current assets	1,472	332
Total current assets	48,033	55,430
Property and equipment, net	31	38
Other non-current assets	10	10
Total assets	48,074	55,478
Current liabilities:
Accounts payable	3,003	2,757
Accrued expenses and other current liabilities	3,231	3,132
Deferred revenue	226	226
Total current liabilities	6,460	6,115
Deferred revenue, non-current	3,130	3,243
Total liabilities	9,590	9,358
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 5,000,000 shares authorized, none issued and outstanding at June 30, 2022 and December 31, 2021
Common stock, $0.01 par value, 125,000,000 shares authorized, 20,895,563 shares issued and outstanding at June 30, 2022 and December 31, 2021	209	209
Additional paid in capital	491,181	490,644
Accumulated deficit	(452,865)	(444,719)
Accumulated other comprehensive loss	(41)	(14)
Total stockholders' equity	38,484	46,120
Total liabilities and stockholders' equity	$ 48,074	$ 55,478