Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Quarterly Financial Data

Selected Quarterly Financial Data (Unaudited)

	For the Quarter Ended
(Dollars in thousands, except per share amounts)	March 31, 2015			June 30, 2015			Sept. 30, 2015			Dec. 31, 2015
Total revenues	$	47,126		$	48,611		$	49,905		$	50,151
Gross profit	29,900			30,460			31,740			31,499
Net loss	(8,165		)	(9,310		)	(8,829		)	(8,549		)
Net loss per share, basic and diluted	(0.11		)	(0.12		)	(0.12		)	(0.11		)
	For the Quarter Ended
(Dollars in thousands, except per share amounts)	March 31, 2014			June 30, 2014			Sept. 30, 2014			Dec. 31, 2014
Total revenues	$	41,029		$	43,375		$	46,600		$	47,689
Gross profit	25,574			26,735			29,365			30,346
Net loss	(17,324		)	(14,630		)	(12,109		)	(12,090		)
Net loss per share, basic and diluted	(0.25		)	(0.21		)	(0.17		)	(0.17		)