Business Segments - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 24,435	$ 29,768	$ 51,404	$ 62,978
Domestic
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	19,526	25,357	41,506	54,125
International
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 4,909	$ 4,411	$ 9,898	$ 8,853