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Significant Accounting Policies - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019
Significant Accounting Policies [Line Items]
Right-of-use asset	$ 2,367,000
Lease liability	2,367,000
ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle for adoption of ASU 2016-02	$ 0
Other Assets [Member]
Significant Accounting Policies [Line Items]
Right-of-use asset		$ 2,210,000
Accrued Expenses and Other Liabilities [Member]
Significant Accounting Policies [Line Items]
Lease liability		$ 2,210,000

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- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794

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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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