Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,442	$ 15,131
Accumulated Amortization	(10,442)	(15,131)
Total	0	0
Estimated Future Amortization Expense [Abstract]
2018	0
2019	0
2020	0
2021	0
2022	0
Thereafter	0
Amortization expense	0	500	$ 500
Intangible assets not subject to amortization	29,000	29,000
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,733	6,422
Accumulated Amortization	(1,733)	(6,422)
Total	0	0
Distributor and Provider Networks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,709	8,709
Accumulated Amortization	(8,709)	(8,709)
Total	$ 0	$ 0