Acquisitions - Additional Information (Detail) - USD ($)	Aug. 07, 2015	Sep. 23, 2014
Business Acquisition [Line Items]
Common stock issued for acquisition		2,284,070
Silevo, Inc. [Member]
Business Acquisition [Line Items]
Cash consideration paid		$ 326,000
Aggregate fair value of common stock on acquisition date		137,958,000
Future obligation		115,300,000
Purchase consideration advance		16,800,000
Silevo, Inc. [Member] | Maximum [Member]
Business Acquisition [Line Items]
Future obligation		$ 150,000,000
Silevo, Inc. [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Common stock issued for acquisition		2,284,070
ILIOSSON, S.A. de C.V. [Member]
Business Acquisition [Line Items]
Cash consideration paid	$ 9,700,000
Future obligation	5,000,000
Earn out payments payable	0
Estimated aggregate earn-out payments	$ 15,600,000