COMPONENTS OF THE COMPANY'S CONDENSED CONSOLIDATED BALANCE SHEETS Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Intangible Assets Table [Line Items]
Intangible Assets, Gross	$ 57,847	$ 57,847
Accumulated Amortization	(46,373)	(45,341)
Finite-Lived Intangible Assets, Net	10,213
Total Intangible Assets, Net	11,474	12,506
Developed technology
Schedule of Intangible Assets Table [Line Items]
Finite-Lived Intangible Assets, Gross	37,960	37,960
Accumulated Amortization	(29,882)	(29,126)
Finite-Lived Intangible Assets, Net	8,078	8,834
Customer relationships
Schedule of Intangible Assets Table [Line Items]
Finite-Lived Intangible Assets, Gross	16,700	16,700
Accumulated Amortization	(15,901)	(15,687)
Finite-Lived Intangible Assets, Net	799	1,013
Technology licenses
Schedule of Intangible Assets Table [Line Items]
Finite-Lived Intangible Assets, Gross	1,926	1,926
Accumulated Amortization	(590)	(528)
Finite-Lived Intangible Assets, Net	1,336	1,398
Domain name
Schedule of Intangible Assets Table [Line Items]
Indefinite-Lived Intangible Assets	1,261	1,261
Accumulated Amortization	$ 0	$ 0