Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 7,650	$ 10,923
Marketable securities		29,790
Restricted cash, short-term	7,802
Prepaid expenses and other current assets	600	1,532
Total current assets	16,052	42,245
Property and equipment, net	366	414
Restricted cash, long-term	242	193
Other assets	81	125
Total assets	16,741	42,977
Current liabilities:
Accounts payable	1,018	1,822
Accrued compensation	982	1,400
Deferred rent, short-term	50	16
Accrued research and clinical liabilities	2,391	3,470
Notes payable, net of discount	7,172	10,928
Financing derivative	341	89
Other accrued liabilities	381	328
Total current liabilities	12,335	18,053
Deferred rent, long-term	268	311
Total liabilities	12,603	18,364
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value: 85,000,000 shares and 85,000,000 shares authorized at September 30, 2015 and December 31, 2014, respectively; 4,123,921 and 4,124,004 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	4	4
Additional paid-in capital	204,609	202,830
Accumulated other comprehensive loss		(8)
Accumulated deficit	(200,475)	(178,213)
Total stockholders' equity	4,138	24,613
Total liabilities and stockholders' equity	$ 16,741	$ 42,977