Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Income per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounting Policies [Abstract]
Net income (loss)	$ (11,285)	$ (9,039)
Basic:
Weighted average common shares outstanding, basic	48,600	50,639
Net income (loss) per share, basic	$ (0.23)	$ (0.18)
Diluted:
Weighted average common shares outstanding, basic	48,600	50,639
Weighted average common shares outstanding, diluted	48,600	50,639
Net income (loss) per share, diluted	$ (0.23)	$ (0.18)

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ Details

- Definition

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.

+ References

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-Publisher FASB
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+ Details

- Definition

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

+ References + Details

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