Income Taxes (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Schedule of difference between income taxes at the statutory federal income tax rate and income taxes reported in the statements of operations in percent
Income tax benefit at the federal statutory rate	34.00%	34.00%
State income taxes, net of effect on federal taxes	3.55%	3.51%
Research and development credit	1.67%	2.84%
Other	(0.21%)	0.56%
Increase in valuation allowance	(39.01%)	(40.91%)
Provision for income tax	0.00%	0.00%