Other Assets - Patent Licenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Finite-lived, intangible assets, net	$ 4,568	$ 6,318	$ 5,092
Finite-lived intangible assets, gross	17,204	17,204
Amortization on patents and tooling	786	391	201
Patent Licenses | Cost of SaaS and License Revenue
Finite-Lived Intangible Assets [Line Items]
Amortization on patents and tooling	$ 600	400	$ 200
Patent Licenses | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)	3 years
Patent Licenses | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life (in years)	11 years
Patent Licenses | Other Assets
Finite-Lived Intangible Assets [Line Items]
Finite-lived, intangible assets, net	$ 3,200	$ 2,200
Finite-lived intangible assets, gross	$ 4,900