Summarized Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Net revenue	$ 16,277	$ 19,512	$ 17,852	$ 14,525	$ 15,627	$ 18,773	$ 16,219	$ 14,607	$ 68,166	$ 65,226	$ 70,961
Loss from operations	(11,115)	(12,486)	(7,000)	(3,359)	(2,739)	(2,320)	(7,344)	(2,283)	(33,960)	(14,686)	(20,120)
Net loss	$ (11,774)	$ (13,139)	$ (7,650)	$ (4,047)	$ (3,416)	$ (4,848)	$ (10,299)	$ (5,349)	$ (36,610)	$ (23,912)	$ (21,542)
Loss per common share, basic (usd per share)	$ (0.77)	$ (1.40)	$ (0.80)	$ (0.45)	$ (0.70)	$ (0.60)	$ (1.35)	$ (0.75)	$ (3.42)	$ (2.60)	$ (3.18)
Loss per common share, diluted (usd per share)	$ (0.77)	$ (1.40)	$ (0.80)	$ (0.45)	$ (0.70)	$ (0.60)	$ (1.35)	$ (0.75)	$ (3.42)	$ (2.60)	$ (3.18)