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Business Segmentation and Geographical Distribution - Additional Information (Detail) (Non-Domestic Revenue [Member], USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue from External Customer [Line Items]
Revenue from international sources	$ 379,000	$ 185,000	$ 457,000	$ 279,000
Product Revenue [Member]
Revenue from External Customer [Line Items]
Revenue from international sources	379,000	115,000	457,000	135,000
Japanese License [Member]
Revenue from External Customer [Line Items]
Revenue from international sources	$ 0	$ 68,000	$ 0	$ 143,000
Royalty Arrangement [Member]
Revenue from External Customer [Line Items]
Agreement expiration date			Mar. 31, 2013

X

- Definition

Final minimum royalty maturity date.

+ References

No definition available.

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X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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