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Quarterly Results Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 52,613	$ 49,075	$ 47,426	$ 47,910	$ 46,344	$ 41,937	$ 40,406	$ 40,129	$ 197,024	$ 168,816	$ 153,276
Gross Profit	33,155	29,599	28,702	28,389	28,197	24,213	24,320	23,520	119,845	100,250	89,923
Operating Income (Loss)	(9,609)	(11,866)	(12,993)	(14,747)	(12,815)	(17,750)	(16,710)	(17,668)	(49,215)	(64,943)	(65,398)
Net Income (Loss) Attributable to Parent	$ (12,760)	$ (15,786)	$ (16,844)	$ (18,856)	$ (16,980)	$ (21,226)	$ (19,513)	$ (20,207)	$ (64,246)	$ (77,926)	$ (75,225)
Basic earnings per share	$ (0.34)	$ (0.44)	$ (0.52)	$ (0.58)	$ (0.53)	$ (0.67)	$ (0.62)	$ (0.65)	$ (1.86)	$ (2.46)	$ (2.47)
Diluted	$ (0.34)	$ (0.44)	$ (0.52)	$ (0.58)	$ (0.53)	$ (0.67)	$ (0.62)	$ (0.65)	$ (1.86)	$ (2.46)	$ (2.47)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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