Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities
Net (loss) income	$ (47,315)	$ (6,406)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,363	3,670
Amortization of debt discount	28
(Gain) on sales of property and equipment	(2)
Impairment of assets	1,258
Share based compensation	4,906	4,092
Loss from changes in fair value of warrants	1,509	990
(Gain)/loss from change in fair value of long term debt	312	(1,242)
Provision for doubtful accounts	279	206
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable	(157)	(371)
Inventory	(1,863)	(52)
Prepaid expenses and other current assets	(3,668)	(409)
Restricted cash	(303)
Other assets	(573)	22
Accounts payable	102	(3,757)
Accrued compensation	1,647	1,789
Other accrued liabilities	6,341	1,839
Deferred revenue	(7)	(9)
Net cash (used in) provided by operating activities	(33,143)	362
Investing Activities
Purchases of investments	(26,353)
Purchases of property and equipment, net	(6,452)	(6,117)
Net cash used in investing activities	(32,805)	(6,117)
Financing Activities
Proceeds from issuance of common stock, net	180,628	(1,606)
Costs paid for senior secured term loan	(6)
Proceeds from equipment financing		1,300
Repayments of equipment financing	(5,850)	(1,798)
Proceeds from collection of officer receivable	192
Change in restricted cash		(319)
Net cash provided by (used in) financing activities	174,964	(2,423)
Net increase (decrease) in cash	109,016	(8,178)
Cash at beginning of period	87,176	30,496
Cash at end of period	196,192	22,318
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	1,575	1,556
Purchases of property and equipment through accounts payable and accruals	1,126	$ 938
Non cash property and equipment purchase	2
Conversion of convertible preferred stock to common stock	$ 240,585