Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 67,564	$ 69,724
Short term investments	23,960	37,078
Prepaid expenses and other current assets	4,829	4,871
Total current assets	96,353	111,673
Property and equipment, net	230	263
Operating lease right-of-use assets, net	343	1,165
Long term investments	19,175	19,933
Other assets	29	194
Total assets	116,130	133,228
Current liabilities:
Accounts payable	3,731	4,911
Accrued expenses and other current liabilities	5,979	9,311
Total current liabilities	9,710	14,222
Long-term operating lease liabilities	40	420
Total liabilities	9,750	14,642
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000,000 authorized, no shares issued and outstanding as of March 31, 2022 and December 31, 2021	0	0
Common stock, $0.001 par value, 100,000,000 shares authorized, 30,149,570 and 30,074,412 issued and outstanding as of March 31, 2022 and December 31, 2021, respectively	30	30
Additional paid in capital	365,096	355,234
Accumulated other comprehensive loss	(506)	(79)
Accumulated deficit	(258,240)	(236,599)
Total stockholders’ equity	106,380	118,586
Total liabilities and stockholders’ equity	$ 116,130	$ 133,228