COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Intangible Assets (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Schedule of Intangible Assets [Table] [Line Items]
Intangible Assets, Gross		$ 60,251	$ 59,911
Finite-Lived Intangible Assets, Accumulated Amortization		(35,180)	(34,492)
Total		25,071	25,419
Finite-Lived Intangible Assets, Net	[1]	19,120
Developed technology
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross		33,270	33,270
Finite-Lived Intangible Assets, Accumulated Amortization		(20,025)	(19,211)
Finite-Lived Intangible Assets, Net		13,245	14,059
Customer relationships
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross		20,030	20,030
Finite-Lived Intangible Assets, Accumulated Amortization		(15,135)	(14,621)
Finite-Lived Intangible Assets, Net		4,895	5,409
Technology licenses
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross		1,000	0
Finite-Lived Intangible Assets, Accumulated Amortization		(20)	0
Finite-Lived Intangible Assets, Net		980	0
In-place leases
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross		0	660
Finite-Lived Intangible Assets, Accumulated Amortization		0	(660)
Finite-Lived Intangible Assets, Net		0	0
Domain name
Schedule of Intangible Assets [Table] [Line Items]
Indefinite-Lived Intangible Assets		1,261	1,261
In-process research and development
Schedule of Intangible Assets [Table] [Line Items]
Indefinite-Lived Intangible Assets		$ 4,690	$ 4,690

[1] The total above excludes $4.7 million of in-process research and development that will be amortized, upon completion of development, over the estimated useful life of the technology.