Consolidated Balance Sheets - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 44,579,000	$ 69,724,000
Short term investments	45,602,000	37,078,000
Prepaid expenses and other current assets	3,567,000	4,871,000
Total current assets	93,748,000	111,673,000
Property and equipment, net	393,000	263,000
Operating lease right-of-use assets, net	291,000	1,165,000
Long term investments	3,578,000	19,933,000
Intangible asset	5,900,000	0
Other assets	0	194,000
Total assets	103,910,000	133,228,000
Current liabilities:
Accounts payable	570,000	4,911,000
Accrued expenses and other current liabilities	2,499,000	9,311,000
Total current liabilities	3,069,000	14,222,000
Long-term operating lease liabilities	0	420,000
Deferred tax liabilities	248,000	0
Total liabilities	3,317,000	14,642,000
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000,000 authorized, no shares issued and outstanding as of December 31, 2022 and 2021, respectively	0	0
Common stock, $0.001 par value, 100,000,000 shares authorized, 36,136,480 and 30,074,412 issued and outstanding as of December 31, 2022 and 2021, respectively	36,000	30,000
Additional paid in capital	389,105,000	355,234,000
Accumulated other comprehensive loss	(289,000)	(79,000)
Accumulated deficit	(288,259,000)	(236,599,000)
Total stockholders’ equity	100,593,000	118,586,000
Total liabilities and stockholders’ equity	$ 103,910,000	$ 133,228,000