General - Additional Information (Detail) $ in Millions	1 Months Ended
Nov. 30, 2016 USD ($)	Jul. 01, 2017 Patents
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of patents generated \| Patents		100
Research and development program award from U.S. Department of energy \| $	$ 4.5

The amount of customer funding recorded as an offset to costs incurred for a fixed-price, best-efforts research and development cost-sharing arrangement with the Federal Government.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 730
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6472174&loc=d3e58812-109433

Name:	us-gaap_ResearchAndDevelopmentArrangementWithFederalGovernmentCustomerFundingToOffsetCostsIncurred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration