Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (166,227)	$ (179,184)	$ (69,126)
Adjustments to reconcile loss to net cash used in operating activities:
Depreciation and amortization	246	180	76
Excess tax provision (benefit) from stock-based awards	361	(11,334)	(4,199)
Accrued interest payable	10,454	2,520
Amortization of debt discount and debt issuance costs	17,631	12,856
Amortization of intangible asset	646	269
Foreign exchange loss on intangible asset		519
(Gain) loss on changes in fair value of derivative liabilities	(47,710)	35,344	22,669
Deferred income taxes	(3,434)	(3,714)	(2,493)
Change in lease liability	6	(50)	(21)
Shares issued for services	27	32	71
Changes in assets and liabilities:
Restricted cash	(1,000)
Accounts receivable	(3,645)
Other current assets	1,690	(1,416)	(774)
Inventory	(5,429)	(21,262)
Other non-current assets	591	(1,060)	(591)
Deferred revenue	1,703
Accounts payable, accrued expenses and other current liabilities	(7,228)	25,675	5,751
Net cash used in operating activities	(190,336)	(122,303)	(39,439)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of equipment	(14)	(549)	(398)
Purchase of long-term investment		(1,650)	(1,650)
Purchase of intangible asset		(12,143)
Net cash used in investing activities	(14)	(14,342)	(2,048)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net of transaction costs	121,206		98,654
Proceeds from exercise of stock options, net of transaction costs	627	8,205	5,094
Proceeds from exercise of warrants, net of transaction costs	160	16,720	18,702
Proceeds on issuance of exchangeable senior notes, net of transaction costs		144,316
Proceeds from long term debt, net of transaction costs		99,730
Excess tax (provision) benefit from stock-based awards	(361)	11,334	4,199
Repayment of capital leases	(10)	(20)	(2)
Net cash provided by financing activities	121,622	280,285	126,647
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(68,728)	143,640	85,160
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	260,242	116,602	31,442
CASH AND CASH EQUIVALENTS, END OF PERIOD	191,514	260,242	116,602
Cash paid during the year for:
Interest	6,090	2,713
Income taxes	1,395	1,118	761
Supplemental disclosure of non-cash items:
Reclass of warrant liability to additional paid-in capital	24	103,885	129,517
Options and Restricted Stock Units
Adjustments to reconcile loss to net cash used in operating activities:
Stock-based compensation	14,685	18,075	9,294
Warrant
Adjustments to reconcile loss to net cash used in operating activities:
Stock-based compensation	$ (3,703)	$ 247	$ (96)