Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net (loss) income	$ (530,113)	$ 3,686
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	17,674	22,517
Asset impairment charges	329,097	0
Amortization of debt discount	20,325	19,392
Unrealized foreign currency transaction losses (gains), net	1,276	(125)
Stock compensation expense	24,078	24,541
Gain on sale of businesses	0	(289,305)
Loss on disposal of fixed assets	72	1
Deferred tax benefit	(89,992)	(1,661)
Extinguishment of debt	0	5,380
Reserve for excess or obsolete inventory	1,797	7,350
Changes in contingent purchase price	(11,788)	13,573
Changes in operating assets and liabilities:
Accounts receivable	14,476	24,125
Inventory, net	1,976	(14,077)
Prepaid expenses and other current assets	5,886	1,907
Accounts payable	(16,898)	(17,265)
Accrued expenses	(5,245)	(49,110)
Deferred revenue	(11,707)	(5,761)
Payments on contingent purchase price	(52,499)	0
Other liabilities	(3,189)	(6,153)
Net cash used in operating activities	(304,774)	(260,985)
Cash flows from investing activities:
Purchases of fixed assets	(4,525)	(920)
Purchases of available for sale securities	(131,560)	0
Proceeds from maturities and sales of available for sale securities	89,344	0
Payments for intangible assets	0	(10,000)
Proceeds from sale of businesses	0	437,875
Change in restricted cash	10	(3,660)
Net cash (used in) provided by investing activities	(46,731)	423,295
Cash flows from financing activities:
Proceeds from issuances of common stock, net	40,708	27,404
Payments on contingent purchase price	(10,119)	(7,921)
Proceeds from the issuance of convertible senior notes	0	402,500
Repayments of convertible senior notes	(55,000)	(323,225)
Purchase of capped call transactions related to convertible senior notes	0	(33,931)
Proceeds from settlement of bond hedges related to convertible senior notes	0	100,459
Settlement of warrants	0	(87,874)
Debt and equity issuance costs	0	(11,725)
Purchase of shares of non-controlling interest	(167)	0
Net cash (used in) provided by financing activities	(24,578)	65,687
Effect of exchange rate changes on cash	982	(814)
(Decrease) increase in cash and cash equivalents	(375,101)	227,183
Cash and cash equivalents at beginning of period	541,835	373,173
Cash and cash equivalents at end of period	166,734	600,356
Supplemental disclosure of cash flow information:
Interest paid	22,561	11,891
Non-cash investing and financing activities
Issuance of common stock upon conversion of convertible notes	32,018	0
Receipt of common stock upon settlement of 2017 Note hedge	40,015	0
Issuance of common stock upon the exercise of the 2017 Warrants	$ 887	$ 0