License Agreements - Additional Information (Detail)	12 Months Ended
Mar. 31, 2016 USD ($) Agreement	Mar. 31, 2015 USD ($)
License Agreements [Line Items]
Number of license agreements \| Agreement	3
Licensing revenue	$ 4,716,000	$ 7,339,000
Funai
License Agreements [Line Items]
License revenue percentage	79.00%	79.00%
Non-refundable minimum annual royalty payments received	$ 3,750,000	$ 3,750,000
Licensing revenue	$ 3,700,000	$ 5,800,000
Termination of license agreement, effective date	Dec. 31, 2016

Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity.

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 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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