Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 9,910		$ 9,910		$ 11,990
Less: accumulated amortization	(8,972)		(8,972)		(10,052)
Intangible assets, net	938		938		1,938	[1]
Amortization of intangible assets	468	$ 651	1,000	$ 1,341
Future Estimated Amortization of Intangible Assets [Abstract]
Remaining six months of 2019	843		843
Year ending December 31, 2020	95		95
Intangible assets, net	938		938		1,938	[1]
Developed Technology [Member]
Intangible Assets, Net [Abstract]
Intangible assets, gross	9,910		$ 9,910		9,910
Developed Technology [Member] | Minimum [Member]
Intangible Assets, Net [Abstract]
Estimated useful life			5 years
Developed Technology [Member] | Maximum [Member]
Intangible Assets, Net [Abstract]
Estimated useful life			6 years
Customer Relationships [Member]
Intangible Assets, Net [Abstract]
Intangible assets, gross	$ 0		$ 0		$ 2,080
Estimated useful life			4 years

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2018.