Basis of Presentation and Consolidation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]
Preferred stock issued	0	0
Net proceeds from stock issuance	$ 1,233
Silver Creek Series B Preferred Stock [Member]
Summary Of Significant Accounting Policies [Line Items]
Preferred stock issued	1,000
Preferred stock price per share	$ 1.35
Net proceeds from stock issuance	$ 1,200
Silver Creek [Member]
Summary Of Significant Accounting Policies [Line Items]
Ownership interest percentage	57.00%	60.00%