Balance Sheet Information (Details Textual) (USD $)			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Office equipment, manufacturing and test equipment, and motor vehicles [Member]	Jun. 30, 2012 Furniture and fixtures [Member]	Jun. 30, 2012 Building [Member]	Jun. 30, 2012 Maximum [Member]	Jun. 30, 2012 Maximum [Member] Computer equipment [Member]	Jun. 30, 2012 Minimum [Member]	Jun. 30, 2012 Minimum [Member] Computer equipment [Member]
Balance Sheet Information (Textual) [Abstract]
Standard term of accounts receivable						60 days		30 days
Useful lives of the assets					30 years	1 year
Period over which assets are deprecated			5 years	7 years			5 years		3 years
Balance Sheet Information (Additional Textual) [Abstract]
Allowance for Doubtful Accounts Receivable	$ 100,000	$ 100,000
Consigned inventory with customers	1,000,000	900,000
Allowance for inventory losses	$ 1,600,000	$ 1,500,000