Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 7,718	$ 2,715
Marketable securities	87,832	24,801
Prepaid expenses and other assets	176	215
Short-term investment	1,866
Deposits	4,476
Total current assets	102,068	27,731
Convertible note receivable	2,067
Investments		2,764
Total assets	104,135	30,495
Current liabilities
Accounts payable and accrued expenses	319	567
Accrued salaries and benefits	733	310
Total current liabilities	1,052	877
Total liabilities	1,052	877
Commitments and contingencies
Stockholders’ equity
Preferred Stock
Common stock, $0.0001 par value, 100,000,000 shares authorized; 89,531,149 and 34,920,222 shares issued at June 30, 2021 and December 31, 2020, respectively; 89,531,146 and 34,920,219 shares outstanding at June 30, 2021 and December 31, 2020, respectively	9	3
Additional paid-in capital	265,255	186,482
Treasury stock, at cost, 3 shares at June 30, 2021 and December 31, 2020	(264)	(264)
Accumulated deficit	(161,917)	(156,603)
Total stockholders' equity	103,083	29,618
Total liabilities and stockholders' equity	104,135	30,495
Series D Preferred Stock
Stockholders’ equity
Preferred Stock
Series D-1 Preferred Stock
Stockholders’ equity
Preferred Stock