Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 114,063	$ 92,053
Marketable securities	3,192	0
Prepaid expenses and other current assets	2,422	1,487
Total current assets	119,677	93,540
Property and equipment, net	265	608
Security deposits	211	211
Total assets	120,153	94,359
Current liabilities:
Accounts payable	1,129	1,998
Accrued expenses and other current liabilities	4,152	6,358
Total current liabilities	5,281	8,356
Long term debt, net of discount	25,115	24,897
Other liabilities	995	882
Total liabilities	31,391	34,135
Commitments and contingencies	0	0
Stockholders' equity:
Common stock, $0.001 par value; 150,000,000 shares authorized, 37,919,824 and 23,607,797 shares issued and 37,500,843 and 23,188,816 shares outstanding at September 30, 2020 and December 31, 2019, respectively	38	24
Additional paid-in capital	346,152	276,286
Treasury stock, 418,981 shares at cost	0	0
Accumulated other comprehensive loss	(4)	0
Accumulated deficit	(257,424)	(216,086)
Total stockholders' equity	88,762	60,224
Total liabilities and stockholders' equity	$ 120,153	$ 94,359