Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net (loss) income	$ (92,464)	$ 5,006
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	7,343	7,561
Amortization of debt discount	6,300	5,516
Unrealized foreign currency transaction gains, net	(573)	(151)
Non-cash stock compensation expense	6,940	7,618
Gain on sale of business	(1,004)	0
Loss on disposal of fixed assets	0	530
Deferred tax benefit	(867)	(433)
Excess tax expense from share-based compensation arrangements	0	282
Gain on remeasurement of equity investment	0	(22,741)
Change in contingent consideration obligation	(1,372)	1,417
Loss in equity investment	0	144
Changes in operating assets and liabilities:
Accounts receivable	9,580	56,032
Inventory, net	(2,347)	(46,006)
Prepaid expenses and other current assets	635	1,214
Accounts payable	(20,559)	(6,142)
Accrued expenses	(31,181)	(44,230)
Deferred revenue	1,993	(933)
Other liabilities	(804)	(5,713)
Net cash used in operating activities	(118,380)	(41,029)
Cash flows from investing activities:
Proceeds from sale of fixed assets	0	250
Purchases of fixed assets	0	(632)
Acquisition of business, net of cash acquired	0	(28,397)
Payments for intangible assets	0	(90,617)
Proceeds from sale of business	174,068	0
Change in restricted cash	(13)	17
Net cash provided by (used in) investing activities	174,055	(119,379)
Cash flows from financing activities:
Proceeds from issuances of common stock, net	5,104	11,975
Milestone payments	(2,773)	(1,000)
Proceeds from the issuance of convertible senior notes	0	400,000
Debt and equity issuance costs	0	(12,769)
Excess tax expense from share-based compensation arrangements	0	(282)
Net cash provided by financing activities	2,331	397,924
Effect of exchange rate changes on cash	(983)	(1,184)
Increase in cash and cash equivalents	57,023	236,332
Cash and cash equivalents at beginning of period	373,173	370,741
Cash and cash equivalents at end of period	430,196	607,073
Supplemental disclosure of cash flow information:
Interest paid	5,000	0
Taxes paid	$ 24	$ 45