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Net Loss Per Share - Basic and Diluted Income (Loss) Per Common Share Computation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net loss used for calculation of basic and diluted EPS	$ (49,536)	$ (37,655)
Denominator:
Weighted average shares outstanding, basic (in shares)	36,936,560	34,958,228
Effect of dilutive securities:
Stock options and restricted stock units (in shares)	0	0
Weighted average shares outstanding, diluted	36,936,560	34,958,228
Basic and diluted net loss per common share (in usd per share)	$ (1.34)	$ (1.08)

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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