COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule of Intangible Assets [Table] [Line Items]
Intangible Assets, Gross	$ 61,177	$ 60,251
Finite-Lived Intangible Assets, Accumulated Amortization	(42,939)	(39,099)
Total	18,238	21,152
Finite-Lived Intangible Assets, Net	16,977
Developed technology
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross	37,960	33,270
Finite-Lived Intangible Assets, Accumulated Amortization	(24,993)	(22,464)
Finite-Lived Intangible Assets, Net	12,967	10,806
Customer relationships
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross	20,030	20,030
Finite-Lived Intangible Assets, Accumulated Amortization	(17,720)	(16,520)
Finite-Lived Intangible Assets, Net	2,310	3,510
Technology licenses
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross	1,926	1,000
Finite-Lived Intangible Assets, Accumulated Amortization	(226)	(115)
Finite-Lived Intangible Assets, Net	1,700	885
Internet Domain Names [Member]
Schedule of Intangible Assets [Table] [Line Items]
Indefinite-Lived Intangible Assets	$ 1,261	1,261
In Process Research and Development [Member]
Schedule of Intangible Assets [Table] [Line Items]
Indefinite-Lived Intangible Assets		$ 4,690