Segment and Geographical Information - Schedule of Revenues Attributed to Geographic Location of Customer (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 51,013	$ 50,196	$ 153,353	$ 151,659
Japan [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total consolidated revenues	8,500	7,300	23,800	20,800
Reportable Geographical Components [Member] | United States [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total consolidated revenues	34,808	33,696	101,376	99,249
Reportable Geographical Components [Member] | International [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total consolidated revenues	$ 16,205	$ 16,500	$ 51,977	$ 52,410