Business Segments - Schedule of Business Segments Adjusted EBITDA (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
	Dec. 14, 2015	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2015	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting [Abstract]
Adjusted EBITDA		$ 12,243	$ 18,125		$ 27,779	$ 47,127
Depreciation and amortization		(3,265)	(3,317)		(10,438)	(9,403)
Stock-based compensation expense		(801)	(2,375)		(3,624)	(5,296)
Goodwill, Impairment Loss		(27,887)	0	$ (75,400)	(27,887)	0
Impairment of Intangible Assets, Finite-lived		(16,818)	0		(16,818)	0
Restructuring Charges	$ (6,700)	(3,142)	0		(3,142)	0
Severance Costs		(1,153)	0		(1,153)	0
Business Development Costs		0	(715)		0	(715)
Inventory Write-down		(950)	0		(950)	0
Change in fair value of contingent consideration		0	167		0	(677)
Professional fees related to ASC 606 implementation		0	(300)		(1,092)	(300)
Executive search fees		0	0		(235)	0
Restatement-related professional fees		(1,358)	0		(1,895)	0
Other professional fees		(81)	0		(162)	0
(Loss) income from operations		(43,212)	11,585		(39,617)	30,736
Interest income		19	31		135	77
Interest expense		(1,769)	(1,198)		(4,854)	(3,239)
Other, net		(301)	426		(1,734)	(962)
(Loss) income before income taxes		(45,263)	10,844		(46,070)	26,612
Nonoperating Income (Expense)		$ (2,051)	$ (741)		$ (6,453)	$ (4,124)