Summary of Significant Accounting Policies - Schedule of Topic 606 Impact (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Condensed Consolidated Statement of Operations
Total revenues	$ 249,815	$ 246,040	$ 768,412	$ 805,022
Selling, general and administrative	84,071	103,177	263,242	318,700
Research and development	30,160	32,508	92,258	92,193
Condensed Consolidated Balance Sheet
Other current assets and prepaid expenses	45,346		45,346		$ 42,513
Accrued expenses	214,907		214,907		230,301
Other long-term liabilities, principally contract liabilities, contingent consideration and line of credit	183,812		183,812		239,955
Accumulated deficit	(1,109,049)		(1,109,049)		(1,036,959)
Condensed Consolidated Statement of Cash Flows
Net loss	(27,655)	(35,917)	(76,969)	(87,336)
Contract liabilities			(50,531)	(49,771)
As originally reported
Condensed Consolidated Statement of Operations
Selling, general and administrative		131,336		396,359
Research and development		32,329		90,944
Condensed Consolidated Balance Sheet
Other current assets and prepaid expenses					37,113
Accrued expenses					215,102
Other long-term liabilities, principally contract liabilities, contingent consideration and line of credit					219,954
Accumulated deficit					(1,007,159)
Condensed Consolidated Statement of Cash Flows
Net loss				(94,965)
Contract liabilities				(42,142)
Accounting Standards Update 2014-09 | Effect of change
Condensed Consolidated Statement of Operations
Total revenues					(29,800)
Selling, general and administrative		(28,159)		(77,659)
Research and development		179		1,249
Condensed Consolidated Balance Sheet
Other current assets and prepaid expenses					5,400
Accrued expenses					15,199
Other long-term liabilities, principally contract liabilities, contingent consideration and line of credit					20,001
Accumulated deficit					(29,800)
Condensed Consolidated Statement of Cash Flows
Net loss				7,629
Contract liabilities				(7,629)	$ 29,800
Services
Condensed Consolidated Statement of Operations
Total revenues	202,811	200,876	630,180	663,333
Services | As originally reported
Condensed Consolidated Statement of Operations
Total revenues		229,035		740,992
Services | Accounting Standards Update 2014-09 | Effect of change
Condensed Consolidated Statement of Operations
Total revenues		(28,159)		(77,659)
Transfer of intellectual property and other
Condensed Consolidated Statement of Operations
Total revenues	$ 21,609	22,369	$ 56,463	67,697
Transfer of intellectual property and other | As originally reported
Condensed Consolidated Statement of Operations
Total revenues		11,665		58,819
Transfer of intellectual property and other | Accounting Standards Update 2014-09 | Effect of change
Condensed Consolidated Statement of Operations
Total revenues		$ 10,704		$ 8,878