Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization	$ (230)	$ (230)	$ (87)
Gross Carrying Value	1,500
Accumulated Amortization	(547)
Total finite-lived intangible assets, net	$ 953	1,183	1,413
Weighted-Average Remaining Useful Life (in years)	4 years 1 month 17 days
Amortization of Intangible Assets	$ 123	123	46
Amortization of intangible assets included in operating expenses	107	107	41
Amortization of Intangible Assets	(230)	$ (230)	$ (87)
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	800
Gross Carrying Value	800
Accumulated Amortization	(292)
Total finite-lived intangible assets, net	$ 508
Weighted-Average Remaining Useful Life (in years)	4 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	(182)
Total finite-lived intangible assets, net	$ 318
Weighted-Average Remaining Useful Life (in years)	4 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	(73)
Total finite-lived intangible assets, net	$ 127
Weighted-Average Remaining Useful Life (in years)	4 years 1 month 17 days