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Share Based Payment (Detail) - Stock-based compensation expense (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-based compensation expense	$ 134	$ 182	$ 364	$ 1,357
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	113	170	308	1,153
Research and Development Expense [Member]
Stock-based compensation expense	$ 21	$ 12	$ 56	$ 204

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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