Other Assets - Patent Licenses (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) patent_license_agreement	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 17,204		$ 17,204		$ 13,827
Number of patent license agreements | patent_license_agreement			2
Finite-lived, intangible assets, net	7,441		$ 7,441		5,092
Amortization on patents			124	$ 101
Cost of SaaS and License Revenue | Patent Licenses
Finite-Lived Intangible Assets [Line Items]
Amortization on patents	100	$ 100	100	$ 100
Other Assets | Patent Licenses
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	3,300		3,300
Finite-lived, intangible assets, net	$ 2,400		$ 2,400		$ 1,500
Minimum | Patent Licenses
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			3 years
Maximum | Patent Licenses
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			11 years