Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
NOL carry forward expiration date	Various dates between 2014 and 2026
Deferred tax assets	$ 47,000
State research and development credit carry forwards	2,900,000
R&D credit carry forwards carry forwards expiration period	Various dates between 2018 and 2027
Minimum tax credit carryover	1,400,000
Credit to additional paid-in capital	4,700,000	9,800
Estimated income tax expense benefit	300,000
Estimated effective tax rate for next fiscal year	1.40%
Valuation allowance necessary for Arizona R&D		1,400,000
Research and development tax credit studies	7,400,000
Liability for unrecognized tax benefits	2,800,000
Estimated uncertain tax positions related to certain state income tax liabilities	106,000
Recognition of unrecognized tax benefits	$ 2,900,000