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COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule of Intangible Assets [Table] [Line Items]    
Intangible Assets, Gross $ 60,427 $ 60,251
Finite-Lived Intangible Assets, Accumulated Amortization (40,354) (39,099)
Total 20,073 21,152
Finite-Lived Intangible Assets, Net [1] 14,122  
Developed technology    
Schedule of Intangible Assets [Table] [Line Items]    
Finite-Lived Intangible Assets, Gross 33,270 33,270
Finite-Lived Intangible Assets, Accumulated Amortization (23,258) (22,464)
Finite-Lived Intangible Assets, Net 10,012 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 (16,947) (16,520)
Finite-Lived Intangible Assets, Net 3,083 3,510
Technology licenses    
Schedule of Intangible Assets [Table] [Line Items]    
Finite-Lived Intangible Assets, Gross 1,176 1,000
Finite-Lived Intangible Assets, Accumulated Amortization (149) (115)
Finite-Lived Intangible Assets, Net 1,027 885
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.