CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 12,761	$ 13,696
Restricted cash	5,500
Marketable securities	16,364
Prepaids and other current assets	1,697	1,504
Total current assets	36,322	15,200
Property and equipment, net	3	11
Operating lease - right-of-use asset	817
Other assets	98	113
Total assets	37,240	15,324
Current liabilities:
Accounts payable	791	1,393
Accrued clinical expense	521	500
Accrued compensation	985	943
Other accrued liabilities	1,109	1,091
Notes payable	5,465	7,396
Operating lease liability - current	545
Total current liabilities	9,416	11,323
Other liabilities	9	8
Operating lease liability - long term	272
Total liabilities	9,697	11,331
Commitments and contingencies (Note 8)
Stockholders’ equity:
Convertible preferred stock, $0.0001 par value; 10,000 shares authorized as of December 31, 2019; 20 and 18 shares issued and outstanding as of December 31, 2019 and 2018, respectively	11,769	20,998
Common stock, $0.0001 par value; 400,000 shares authorized as of December 31, 2019; 111,393 and 37,474 shares issued and outstanding as of December 31, 2019 and 2018, respectively	11	4
Additional paid-in capital	698,562	642,460
Accumulated other comprehensive income	1
Accumulated deficit	(682,800)	(659,469)
Total stockholders’ equity	27,543	3,993
Total liabilities and stockholders’ equity	$ 37,240	$ 15,324