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Stock-Based Awards - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 20, 2016	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
PRSU
Shares of common stock authorized to issue under equity award plan	10,000,000
Stock-based compensation expense		$ 2,374	$ 3,240	$ 8,581	$ 10,078
Below 25th Percentile [Member]
PRSU
Shares granted and outstanding, Vesting percentage				0.00%
Above 25th Percentile [Member]
PRSU
Shares granted and outstanding, Vesting percentage				50.00%
At 50th Percentile [Member]
PRSU
Shares granted and outstanding, Vesting percentage				100.00%
At 100th Percentile [Member]
PRSU
Shares granted and outstanding, Vesting percentage				200.00%
Performance Based Restricted Stock Unit [Member] | Maximum [Member]
PRSU
Shares granted and outstanding, Vesting percentage				200.00%
Performance Based Restricted Stock Unit [Member] | Minimum [Member]
PRSU
Shares granted and outstanding, Vesting percentage				0.00%

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
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+ References

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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