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Basis of Presentation - Additional Information (Detail) - ASU No. 2016-09 - U S Federal And State Jurisdiction $ in Millions	Jan. 01, 2017 USD ($)
Revisions [Line Items]
Net operating loss carry forwards	$ 5.3
Increase in valuation allowance	5.3
Impact of adopting ASU 2016-09 on retained earnings	$ 0.0

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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