CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	[1]
Current assets:
Cash and cash equivalents	$ 24,811	$ 13,696
Prepaids and other current assets	1,599	1,504
Total current assets	26,410	15,200
Property and equipment, net	9	11
Operating lease right-of-use asset	1,226
Other assets	109	113
Total assets	27,754	15,324
Current liabilities:
Accounts payable	861	1,393
Accrued clinical expense	420	500
Accrued compensation	677	943
Other accrued liabilities	1,440	1,091
Notes payable	6,032	7,396
Operating lease liability - current	545
Total current liabilities	9,975	11,323
Other liabilities	12	8
Operating lease liability - long term	681
Total liabilities	10,668	11,331
Commitments and contingencies
Stockholders’ equity:
Convertible preferred stock	25,647	20,998
Common stock	7	4
Additional paid-in capital	656,761	642,460
Accumulated deficit	(665,329)	(659,469)
Total stockholders’ equity	17,086	3,993
Total liabilities and stockholders’ equity	$ 27,754	$ 15,324

[1] The condensed consolidated balance sheet as of December 31, 2018, has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.