Goodwill and Intangible Assets, Net - Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 17,204	$ 17,204
Accumulated Amortization	(12,636)	(10,886)
Net Carrying Value	4,568	6,318	$ 5,092
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,666	10,666
Accumulated Amortization	(7,303)	(6,217)
Net Carrying Value	3,363	4,449	3,853
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,390	5,390
Accumulated Amortization	(4,342)	(3,904)
Net Carrying Value	1,048	1,486	918
Trade Name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	914	914
Accumulated Amortization	(757)	(641)
Net Carrying Value	157	273	94
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	234	234
Accumulated Amortization	(234)	(124)
Net Carrying Value	$ 0	$ 110	$ 227
Weighted-Average | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted- average Remaining Life (years)	3 years 9 months 19 days	4 years 6 months
Weighted-Average | Developed Technology
Finite-Lived Intangible Assets [Line Items]
Weighted- average Remaining Life (years)	4 years 1 month 20 days	4 years 9 months 18 days
Weighted-Average | Trade Name
Finite-Lived Intangible Assets [Line Items]
Weighted- average Remaining Life (years)	4 years 3 months	4 years 8 months 12 days
Weighted-Average | Other
Finite-Lived Intangible Assets [Line Items]
Weighted- average Remaining Life (years)	0 days	10 months 24 days