Shareholders' Equity (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Impact on the results of operations of recording stock-based compensation expense
Total stock-based compensation expense	$ 408	$ 607	$ 892	$ 1,107
Per diluted share	$ 0.04	$ 0.05	$ 0.08	$ 0.09
Cost of revenue - service [Member]
Impact on the results of operations of recording stock-based compensation expense
Total stock-based compensation expense	100	157	207	376
Selling, general and administrative [Member]
Impact on the results of operations of recording stock-based compensation expense
Total stock-based compensation expense	248	415	622	654
Research and development [Member]
Impact on the results of operations of recording stock-based compensation expense
Total stock-based compensation expense	$ 30	$ 35	$ 63	$ 77