Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes (Additional Textual) [Abstract]
Net operating loss associated with excess benefits related to stock compensation	$ 3,100,000
Federal statutory tax rate	35.00%	35.00%	35.00%
Provision for federal and state income taxes on undistributed earnings of foreign subsidiaries	0
Accrued interest or penalties related to uncertain tax positions	56,000
Total amount of unrecognized tax benefits	255,000
CA [Member]
Income Taxes (Textual) [Abstract]
Research and development credit carryforwards	1,600,000
Tax credit carryforward expiration year	2032
Domestic Tax Authority [Member]
Income Taxes (Textual) [Abstract]
Net operating loss carryforwards	64,400,000
Net operating losses expiration Beginning Period	2020
Federal net operating losses expiration ending Period	2032
Tax credit carryforwards	8,000,000
Federal credit carryforward expiration, Beginning Period	2015
Federal credit carryforward expiration ending Period	2032
State and Local Jurisdiction [Member]
Income Taxes (Textual) [Abstract]
Net operating loss carryforwards	53,000,000
Net operating losses expiration Beginning Period	2028
Tax credit carryforwards	$ 865,000