Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net loss	$ (47,844)	$ (36,572)
Depreciation	248	55
Accretion of debt discount	400	482
Amortization of intangible assets	728	728
Derivative loss		14,631
Stock-based compensation expense	12,703	4,857
Changes in assets and liabilities:
Accounts receivable	1,734	2,589
Inventories	(59)	(2,024)
Prepaid expenses and other assets	(727)	(805)
Accounts payable and accrued expenses	477	2,978
Deferred revenue	(377)	2,282
Net cash flows from operating activities	(32,717)	(10,799)
Investing activities:
Purchase of equipment	(619)	(1,554)
Net cash flows from investing activities	(619)	(1,554)
Financing activities:
Proceeds from sales of securities		70,718
Equity financing costs	(40)
Proceeds from exercise of stock options	480	4,573
Proceeds from exercise of common stock warrants	1	4,931
Payment on note payable	(3,335)	(5,333)
Proceeds from notes payable	20,667
Payment of deferred financing fees	(486)
Return of short swing profits	6	82
Net cash flows from financing activities	17,293	74,971
Net change in cash and cash equivalents	(16,043)	62,618
Cash and cash equivalents at beginning of year	70,472	23,176
Cash and cash equivalents at end of period	54,429	85,794
Cash paid for interest	$ 1,201	$ 1,065