Segment and Geographical Information - Schedule of Revenues Attributed to Geographic Location of Customer (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 53,167	$ 51,020	$ 102,340	$ 101,463
Japan [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total consolidated revenues	7,700	7,100	15,400	13,500
Reportable Geographical Components [Member] | United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total consolidated revenues	34,518	32,491	66,568	65,553
Reportable Geographical Components [Member] | International [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 18,649	$ 18,529	$ 35,772	$ 35,910