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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Payment Award
Stock option issuance period				10 years
Option vested period				1 year
Shares of common stock authorized to issue under equity award plan	10,000,000
Stock-based compensation expense		$ 2,844	$ 2,374	$ 9,003	$ 8,581
Below 25th Percentile [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage				0.00%
At 25th Percentile [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage				50.00%
At 50th Percentile [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage				100.00%
At 100th Percentile [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage				200.00%
Performance Based Restricted Stock Unit [Member] | Maximum [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage				200.00%
Performance Based Restricted Stock Unit [Member] | Minimum [Member]
Share-based Payment Award
Shares granted and outstanding, Vesting percentage				0.00%

X

- 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)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

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- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

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-Topic 718
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- Definition

Stock option issuance period.

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