Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012
Summary Of Significant Accounting Policies [Line Items]
Reserve for sales returns	$ 742,000		$ 742,000		$ 863,000
Common shares issuable upon exercise of warrants or rights	692,000	515,000	692,000	515,000
Change in fair value of derivative liabilities		3,100,000		3,900,000
Research and development	742,000	312,000	1,257,000	546,000
Income tax expenses	262,000	(1,309,000)	2,963,000	(837,000)
Effective tax rate			39.63%
Statutory tax rate			35.00%
United States [Member]
Summary Of Significant Accounting Policies [Line Items]
Long-lived assets	3,200,000		3,200,000
Japan [Member]
Summary Of Significant Accounting Policies [Line Items]
Long-lived assets	2,500,000		2,500,000
Cash accounts held primarily at financial institution [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk			18,400,000
Investment management account at another financial institution [Member]
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk			$ 10,000,000