Symphony Dynamo, Inc. - Additional Information (Detail) - Symphony Dynamo, Inc. - USD ($)	1 Months Ended	12 Months Ended
Nov. 30, 2009	Dec. 31, 2016
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Business acquisition contingent consideration percentage	50.00%
Business acquisition upfront payment	$ 50,000,000
Milestone payments		$ 0

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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