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Significant Accounting Policies - Recently Issued Accounting Standards (Detail) - USD ($)		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2018
ASU 2014-09
New accounting pronouncement, modified retrospective method
Cumulative impact of adoption on prior financial statements		$ 0
ASU 2017-01
New accounting pronouncement, modified retrospective method
Impact of adoption on financial statements		0
ASU 2017-09
New accounting pronouncement, modified retrospective method
Impact of adoption on financial statements		$ 0
Restatement Adjustment Forecast | ASU 2016-02
New accounting pronouncement, modified retrospective method
Transition package of practical expedients	true
Operating Lease, Right-of-Use Asset	$ 3,600,000
Operating Lease, Liability	$ 4,300,000

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- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 10
-Section 65
-Paragraph 1
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Present value of lessee's discounted obligation for lease payments from operating lease.

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