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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2019	Mar. 31, 2019
Summary Of Significant Accounting Policy [Line Items]
Operating lease, right-of-use asset	$ 10,322	$ 9,502
Operating lease, right-of-use liability	10,322	$ 9,519
ASU 2018-02 [Member]
Summary Of Significant Accounting Policy [Line Items]
Reclassification of tax effects related to adoption ASU	$ 400

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Summary of significant accounting policy.

+ References

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- Definition

Tax cuts and jobs act reclassification from AOCI to retained earnings tax effect.

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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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