Business Segment Information - Reconciliation of Reportable Segment Amounts (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Segment reporting operating income (loss)	$ (7,135)	$ (9,989)	$ (17,778)	$ (6,898)	$ (15,545)	$ (10,279)	$ (8,420)	$ (7,570)	$ (41,800)	$ (41,814)	$ (32,258)
Corporate payroll and benefits									23,589	20,767	16,228
Corporate rent and occupancy									3,309	2,468	2,128
Corporate legal and professional fees									16,604	14,430	4,534
Corporate general and administrative									6,104	6,066	4,101
Corporate depreciation and amortization									2,019	1,865	1,648
Interest income									24	74	109
Other income (expense)									494	26	(44)
Income tax (expense) benefit	131	(44)	(63)	(44)	(141)	(113)	(29)	(13)	(20)	(296)	(463)
Net income (loss)	$ (2,908)	$ (8,654)	$ (12,447)	$ (6,132)	$ 4,677	$ (3,699)	$ 992	$ (583)	(30,141)	1,387	(15,987)
Operating Segments
Segment Reporting Information [Line Items]
Segment reporting operating income (loss)									4,548	28,746	1,733
Segment Reconciling Items
Segment Reporting Information [Line Items]
Corporate payroll and benefits									(14,842)	(12,621)	(10,898)
Corporate rent and occupancy									(707)	(694)	(593)
Corporate legal and professional fees									(15,199)	(9,514)	(2,563)
Corporate general and administrative									(3,640)	(3,980)	(2,961)
Corporate depreciation and amortization									(578)	(354)	(307)
Interest income									24	74	109
Other income (expense)									273	26	(44)
Income tax (expense) benefit									$ (20)	$ (296)	$ (463)