Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 80,003	$ 16,571
Accounts receivable	145	1,042
Unbilled revenue	212	380
Inventories - current	572	424
Prepaid expenses and other current assets	704	278
Total current assets	81,636	18,695
Property and equipment, net	633	728
Inventories - noncurrent	2,101	2,149
Cost method investment	500	500
Other noncurrent assets	118	2,817
Total assets	84,988	24,889
Current liabilities:
Accounts payable and accrued expenses	4,677	3,197
Amounts due to related parties	10	56
Promissory notes - current		1,055
Convertible promissory notes	3,456	4,551
Unearned revenue - current	952	830
Derivative liabilities related to convertible promissory notes	2,688	1,580
Total current liabilities	11,783	11,269
Notes payable	19,349
Note payable to related party		8,000
Promissory notes - noncurrent		869
Unearned revenue - noncurrent	2,930	3,636
Other noncurrent liabilities	3,000	3,000
Total liabilities	$ 37,062	$ 26,774
Stockholders' equity (deficit):
Preferred stock, $0.001 par value-20,000,000 and 0 shares authorized as of June 30, 2015 and December 31, 2014; no shares issued and outstanding as of June 30, 2015 and December 31, 2014
Common stock, $0.001 par value-400,000,000 and 140,000,000 shares authorized as of June 30, 2015 and December 31, 2014; 43,581,695 and 2,074,030 shares issued and outstanding as of June 30, 2015 and December 31, 2014	$ 44
Additional paid-in capital	171,332	$ 29,204
Accumulated deficit	(123,450)	(113,970)
Total stockholders' equity (deficit)	47,926	(84,766)
Total liabilities, redeemable and convertible preferred stock and stockholders' equity (deficit)	$ 84,988	24,889
Redeemable Convertible Preferred Stock [Member]
Current liabilities:
Convertible preferred stock		34,098
Convertible Preferred Stock [Member]
Current liabilities:
Convertible preferred stock		$ 48,783