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Nature of Operations - Additional Information (Detail)	1 Months Ended
	Mar. 31, 2017 shares
Class A common stock | Secondary Offering
Organization Consolidation and Presentation of Financial Statements [Line Items]
Number of shares sold by selling shareholders net of option granted to underwriters	7,281,789

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Organization consolidation and presentation of financial statements.

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- Definition

Stock sold during period shares selling stockholders net of option granted to underwriters.

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