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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) attributable to common stockholders	$ 3,150	$ (22,652)	$ (52,210)	$ (45,853)
Denominator:
Weighted average common shares outstanding, basic	55,974,080	46,929,498	53,165,774	46,766,562
Weighted average common shares outstanding, diluted	58,313,002	46,929,498	53,165,774	46,766,562
Net income (loss) per common share, basic (in dollars per share)	$ 0.06	$ (0.48)	$ (0.98)	$ (0.98)
Net income (loss) per common share, diluted (in dollars per share)	$ 0.05	$ (0.48)	$ (0.98)	$ (0.98)

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- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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