Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization	$ (228)	$ (230)
Gross Carrying Value	1,500
Accumulated Amortization	(775)
Total finite-lived intangible assets, net	$ 725	953	$ 1,183
Weighted-Average Remaining Useful Life (in years)	3 years 1 month 17 days
Amortization of Intangible Assets	$ 121	123
Amortization of intangible assets included in operating expenses	107	107
Amortization of Intangible Assets	(228)	$ (230)
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets				$ 800
Gross Carrying Value	800
Accumulated Amortization	(414)
Total finite-lived intangible assets, net	$ 386
Weighted-Average Remaining Useful Life (in years)	3 years 1 month 17 days
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets				500
Gross Carrying Value	$ 500
Accumulated Amortization	(258)
Total finite-lived intangible assets, net	$ 242
Weighted-Average Remaining Useful Life (in years)	3 years 1 month 17 days
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets				$ 200
Gross Carrying Value	$ 200
Accumulated Amortization	(103)
Total finite-lived intangible assets, net	$ 97
Weighted-Average Remaining Useful Life (in years)	3 years 1 month 17 days