Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 8,161	$ 29,268
Inventory, net	109	482
Prepaid expenses and other current assets	636	1,244
Total current assets	8,906	30,994
Property and equipment, net of accumulated depreciation of $1,401 and $1,242, respectively	1,546	1,582
Intangible assets, net of accumulated amortization of $0 and $2,204, respectively	0	4,136
Other assets	64	0
Total assets	10,516	36,712
Current liabilities:
Accounts payable	553	499
Related party payable	924	10,720
Accrued expenses	1,253	1,779
Deferred revenue	408	457
Warrant liability, current	5	1,910
Total current liabilities	3,143	15,365
Warrant liability, long term	759	6,365
Deferred rent	785	779
Total liabilities	4,687	22,509
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares outstanding as of June 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 June 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	162,555	161,330
Accumulated deficit	(156,770)	(147,171)
Total stockholders’ equity	5,829	14,203
Total liabilities and stockholders’ equity	$ 10,516	$ 36,712