Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 7,981	$ 2,715
Marketable securities	92,426	24,801
Prepaid expenses and other assets	199	215
Short-term investment	2,298
Total current assets	102,904	27,731
Convertible note receivable	2,027
Investments		2,764
Total assets	104,931	30,495
Current liabilities
Accounts payable and accrued expenses	244	567
Accrued salaries and benefits	315	310
Total current liabilities	559	877
Total liabilities	559	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 March 31, 2021 and December 31, 2020, respectively; 89,531,146 and 34,920,219 shares outstanding at March 31, 2021 and December 31, 2020, respectively	9	3
Additional paid-in-capital	265,192	186,482
Treasury stock, at cost, 3 shares at March 31, 2021 and December 31, 2020	(264)	(264)
Accumulated deficit	(160,565)	(156,603)
Total stockholders’ equity	104,372	29,618
Total liabilities and stockholders’ equity	104,931	30,495
Series D Preferred Stock
Stockholders’ equity
Preferred Stock
Series D-1 Preferred Stock
Stockholders’ equity
Preferred Stock