License Agreements - Additional Information (Detail)		1 Months Ended
Jun. 30, 2016 USD ($)	Jun. 30, 2016 GBP (£)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 GBP (£)	Feb. 28, 2018 USD ($)	May 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 GBP (£)	Jun. 30, 2016 GBP (£)
Licenses Agreements [Line Items]
License fee	$ 807,000	£ 600,000
Accrued license fee	425,000		$ 425,000		$ 83,400	$ 167,000	$ 807,000	£ 300,000	£ 300,000
Annual license fee	$ 425,000	£ 300,000	$ 425,000	£ 300,000

Costs incurred and are directly related to generating license revenue. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Name:	us-gaap_LicenseCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration