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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)