Segment and Geographic Information - Schedules of Revenue from External Customers by Geographic Areas, Total Sales by Product Category, and Long-lived Assets by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 39,533		$ 35,901	$ 34,752	$ 31,068	$ 31,978		$ 27,195	$ 26,579	$ 25,842	$ 141,254		$ 111,594		$ 90,918
Long-Lived Assets	19,025					12,695					19,025		12,695
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue											109,597		82,307		64,801
Long-Lived Assets	13,873					7,446					13,873		7,446
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue											12,349		11,233		9,388
Long-Lived Assets	3,472					3,615					3,472		3,615
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue											19,308	[1]	18,054	[1]	16,729	[1]
Long-Lived Assets	1,680	[1]				1,634	[1]				1,680	[1]	1,634	[1]
Exclusive Technology Products [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue											125,013		92,461		72,805
Traditional Fusion Products [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue											$ 16,241		$ 19,133		$ 18,113

[1] No additional locations are individually significant.