Subsequent Events - Additional Information (Detail)	1 Months Ended
Jan. 31, 2018 USD ($)
Subsequent Event
Subsequent Event [Line Items]
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants	$ 100

Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholder, which takes precedence over common stockholders in the event of liquidation and from issuance of rights to purchase common shares at a predetermined price.

No definition available.

Name:	us-gaap_ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration