Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 21,283	$ 29,268
Inventory, net	0	482
Prepaid expenses and other current assets	374	1,244
Total current assets	21,657	30,994
Property and equipment, net of accumulated depreciation of $1,486 and $1,242, respectively	1,492	1,582
Intangible assets, net of accumulated amortization of $0 and $2,204, respectively	0	4,136
Other assets	64	0
Total assets	23,213	36,712
Current liabilities:
Accounts payable	361	499
Related party payable	341	10,720
Accrued expenses	1,715	1,779
Interest payable	46	0
Deferred revenue	0	457
Warrant liability, current	0	1,910
Total current liabilities	2,463	15,365
Convertible promissory notes, net of debt discount of $18,088 and $0, respectively (see Note 5)	0	0
Warrant liability, long term	7,400	6,365
Derivative liability	1,524	0
Deferred rent	788	779
Total liabilities	12,175	22,509
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares outstanding as of September 30, 2016 and December 31, 2015	0	0
Common stock, $0.001 par value; 150,000,000 shares authorized, 43,898,785 shares issued and outstanding as of September 30, 2016; 100,000,000 shares authorized, 43,898,785 shares issued and outstanding as of December 31, 2015	44	44
Additional paid-in capital	170,063	161,330
Accumulated deficit	(159,069)	(147,171)
Total stockholders’ equity	11,038	14,203
Total liabilities and stockholders’ equity	$ 23,213	$ 36,712