The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2006	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets				$ 0
Amortization of intangible assets and other		$ 0	$ 267	16	$ 801
Finite-lived intangible assets [Abstract]
Accumulated amortization		(7,469)		(7,469)		$ (7,453)
Indefinite life intangible assets [Abstract]
Gross carrying value		250		250		250
Net carrying value		250		250		250
Intangible assets, total [Abstract]
Gross carrying value		7,719		7,719		7,719
Accumulated amortization		(7,469)		(7,469)		(7,453)
Net carrying value		250		250		266
Indefinite life intangibles acquired	$ 250
Non-compete [Member]
Finite-lived intangible assets [Abstract]
Gross carrying value		593		593		593
Accumulated amortization		(593)		(593)		(581)
Net carrying value		0		0		12
Intangible assets, total [Abstract]
Accumulated amortization		(593)		(593)		(581)
Partner Relationships [Member]
Finite-lived intangible assets [Abstract]
Gross carrying value		145		145		145
Accumulated amortization		(145)		(145)		(145)
Net carrying value		0		0		0
Intangible assets, total [Abstract]
Accumulated amortization		(145)		(145)		(145)
Customer Base [Member]
Finite-lived intangible assets [Abstract]
Gross carrying value		641		641		641
Accumulated amortization		(641)		(641)		(637)
Net carrying value		0		0		4
Intangible assets, total [Abstract]
Accumulated amortization		(641)		(641)		(637)
Technology Rights [Member]
Finite-lived intangible assets [Abstract]
Gross carrying value		5,330		5,330		5,330
Accumulated amortization		(5,330)		(5,330)		(5,330)
Net carrying value		0		0		0
Intangible assets, total [Abstract]
Accumulated amortization		(5,330)		(5,330)		(5,330)
Tradenames [Member]
Finite-lived intangible assets [Abstract]
Gross carrying value		760		760		760
Accumulated amortization		(760)		(760)		(760)
Net carrying value		0		0		0
Intangible assets, total [Abstract]
Accumulated amortization		$ (760)		$ (760)		$ (760)
Minimum [Member] \| Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				1 year
Maximum [Member] \| Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				6 years