Summarized Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Net revenues	$ 15,314	$ 18,530	$ 17,405	$ 16,205	$ 16,277	$ 19,512	$ 17,852	$ 14,525	$ 67,454	$ 68,166	$ 65,226
Loss from operations	(6,484)	(5,388)	(7,047)	(4,764)	(11,115)	(12,486)	(7,000)	(3,359)	(23,683)	(33,960)	(14,686)
Net loss	$ (6,587)	$ (5,388)	$ (7,045)	$ (5,177)	$ (11,774)	$ (13,139)	$ (7,650)	$ (4,047)	$ (24,197)	$ (36,610)	$ (23,912)
Loss per common share, basic (usd per share)	$ (0.19)	$ (0.18)	$ (0.23)	$ (0.26)	$ (0.77)	$ (1.40)	$ (0.80)	$ (0.45)	$ (0.86)	$ (3.42)	$ (2.60)
Loss per common share, diluted (usd per share)	$ (0.19)	$ (0.18)	$ (0.23)	$ (0.26)	$ (0.77)	$ (1.40)	$ (0.80)	$ (0.45)	$ (0.86)	$ (3.42)	$ (2.60)