Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	[1]
Current assets:
Cash and cash equivalents	$ 46,714	$ 44,579
Short term investments	43,489	45,602
Prepaid expenses and other current assets	2,288	3,567
Total current assets	92,491	93,748
Assets held for sale	105	0
Property and equipment, net	6	393
Operating lease right-of-use assets, net	171	291
Long term investments	475	3,578
Intangible asset	0	5,900
Equity investment in Lighthouse, Inc.	70	0
Total assets	93,318	103,910
Current liabilities:
Accounts payable	1,651	570
Accrued expenses and other current liabilities	1,464	2,499
Total current liabilities	3,115	3,069
Deferred tax liabilities	0	248
Total liabilities	3,115	3,317
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000,000 authorized, no shares issued and outstanding as of March 31, 2023 and December 31, 2022	0	0
Common stock, $0.001 par value, 100,000,000 shares authorized, 36,278,433 and 36,136,480 issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	36	36
Additional paid in capital	390,642	389,105
Accumulated other comprehensive income (loss)	38	(289)
Accumulated deficit	(300,513)	(288,259)
Total stockholders’ equity	90,203	100,593
Total liabilities and stockholders’ equity	$ 93,318	$ 103,910

[1] The balance sheet as of December 31, 2022 is derived from the audited financial statements as of that date.