COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Intangible Assets [Table] [Line Items]
Intangible Assets, Gross	$ 57,847	$ 61,177
Finite-Lived Intangible Assets, Accumulated Amortization	(42,099)	(44,312)
Total	15,748	16,865
Finite-Lived Intangible Assets, Net	14,487
Developed technology
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross	37,960	37,960
Finite-Lived Intangible Assets, Accumulated Amortization	(26,730)	(25,933)
Finite-Lived Intangible Assets, Net	11,230	12,027
Customer relationships
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross	16,700	20,030
Finite-Lived Intangible Assets, Accumulated Amortization	(15,025)	(18,098)
Finite-Lived Intangible Assets, Net	1,675	1,932
Technology licenses
Schedule of Intangible Assets [Table] [Line Items]
Finite-Lived Intangible Assets, Gross	1,926	1,926
Finite-Lived Intangible Assets, Accumulated Amortization	(344)	(281)
Finite-Lived Intangible Assets, Net	1,582	1,645
Internet Domain Names [Member]
Schedule of Intangible Assets [Table] [Line Items]
Indefinite-Lived Intangible Assets	$ 1,261	$ 1,261