Legal Proceedings - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended		9 Months Ended	0 Months Ended
	Jul. 24, 2012 LegalMatter	Jun. 14, 2013 LegalMatter	Jan. 31, 2015	Aug. 27, 2012 LegalMatter	Apr. 17, 2012 LegalMatter	Aug. 05, 2011 LegalMatter	Apr. 23, 2013 LegalMatter	Nov. 27, 2013 LegalMatter	Jan. 25, 2013 LegalMatter
Technology Properties Limited
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed	1
Legal Claim 1
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed		1
Damages awarded			$ 1,330
Commonwealth Scientific and Industrial Research Organisation
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed				1
Kevin Khoa Nguyen
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed					1
Lina
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed						1
Jones
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed							1
Carag
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed								1
Trimmer
Loss Contingencies [Line Items]
Number of putative shareholder derivative complaints filed									1