Stockholders' Equity - Summary of Company's Initial Public Offering (Footnote Information) (Detail) - Minimum	Jun. 30, 2017 USD ($)
Ohio
Class of Stock [Line Items]
Minimum common stock subscription value	$ 7,000,000
Pennsylvania
Class of Stock [Line Items]
Minimum common stock subscription value	75,000,000
Washington
Class of Stock [Line Items]
Minimum common stock subscription value	$ 10,000,000

Monetary value of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643

Name:	us-gaap_CommonStockSharesSubscriptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant