Equity (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		6 Months Ended		9 Months Ended		6 Months Ended		9 Months Ended		6 Months Ended		9 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Research and Development Expense [Member]	Sep. 30, 2011 Research and Development Expense [Member]	Sep. 30, 2012 Research and Development Expense [Member]	Sep. 30, 2011 Research and Development Expense [Member]	Sep. 30, 2012 Selling and Marketing Expense [Member]	Sep. 30, 2011 Selling and Marketing Expense [Member]	Sep. 30, 2012 Selling and Marketing Expense [Member]	Sep. 30, 2011 Selling and Marketing Expense [Member]	Sep. 30, 2012 General and Administrative Expense [Member]	Sep. 30, 2011 General and Administrative Expense [Member]	Sep. 30, 2012 General and Administrative Expense [Member]	Sep. 30, 2011 General and Administrative Expense [Member]	Sep. 30, 2012 Director Expense [Member]	Sep. 30, 2011 Director Expense [Member]	Sep. 30, 2012 Director Expense [Member]	Sep. 30, 2011 Director Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 109	$ 207	$ 376	$ 613	$ 45	$ 78	$ 166	$ 284	$ 27	$ 37	$ 70	$ 128	$ 30	$ 70	$ 117	$ 129	$ 7	$ 22	$ 23	$ 72