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Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss) available for common shareholders - basic	$ 289	$ (5,762)	$ (15,302)	$ (17,367)
Denominator:
Weighted-average common shares outstanding - basic	93,073	74,922	84,388	70,828
Dilutive incremental share effect from:
Options	1	0	0	0
Nonvested restricted stock units	130	0	0	0
Weighted-average shares outstanding - diluted	93,204	74,922	84,388	70,828
Net income (loss) per share - basic	$ 0.00	$ (0.08)	$ (0.18)	$ (0.25)
Net income (loss) per share - diluted	$ 0.00	$ (0.08)	$ (0.18)	$ (0.25)

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