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Share-based Compensation - Schedule of Unvested RSU Activity (Detail) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested, Number of units Beginning balance | shares	2,237,827
Vested and delivered, Number of units | shares	(35,250)
Vested not delivered, Number of units | shares	(12,000)
Forfeited, Number of units | shares	(5,000)
Unvested, Number of units Ending balance | shares	2,185,577
Unvested, Weighted average grant-date fair value, Beginning balance | $ / shares	$ 8.88
Vested and delivered, Weighted average grant-date fair value | $ / shares	7.25
Vested not delivered, Weighted average grant-date fair value | $ / shares	6.10
Forfeited, Weighted average grant-date fair value | $ / shares	7.25
Unvested, Weighted average grant-date fair value, Ending balance | $ / shares	$ 8.92

X

- Definition

Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested and delivered.

+ References

No definition available.

+ Details

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X

- Definition

Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested and delivered in period, weighted average grant date fair value.

+ References

No definition available.

+ Details

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- Definition

Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period not delivered.

+ References

No definition available.

+ Details

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- Definition

Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested not delivered in period, weighted average grant date fair value.

+ References

No definition available.

+ Details

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X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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X

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ 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
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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X

- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ 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
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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.

+ References

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