Basis of Presentation and Consolidation - Schedule of Non-Controlling Interest in Subsidiary (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Minority Interest [Line Items]
Balance at the beginning of the period			$ (1,539)	$ 239
Net loss attributable to Silver Creek	$ (724)	$ (208)	(1,191)	(393)
Balance at the end of the period	$ (2,031)	$ (154)	(2,031)	$ (154)
Series C Preferred Stock [Member]
Minority Interest [Line Items]
Issuance of Silver Creek Series C preferred stock			$ 699