Compensation Plan for Board Members (Details)	6 Months Ended
Jun. 30, 2017 shares
Board Members [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Issuance of common stock to board members in lieu of cash payments for quarterly board fees (shares)	157,756

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration