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Loss Per Share - Reconciliation of Weighted Average Shares Used in Computation of Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net loss available to common stockholders	$ (22,542)	$ (18,559)	$ (51,700)	$ (54,803)
Shares used in loss per share - basic and diluted (in shares)	23,600	23,106	23,578	23,103
Loss per share - basic and diluted (in dollars per share)	$ (0.96)	$ (0.80)	$ (2.19)	$ (2.37)

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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