Stock-Based Compensation (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2012 Restricted Stock and Restricted Stock Units [Member]	Mar. 31, 2013 Director group [Member]	Mar. 31, 2013 Director group [Member] 2008 Equity Incentive Plan [Member] Restricted Stock and Restricted Stock Units [Member]	Mar. 31, 2013 Director Group 1 [Member]	Mar. 31, 2013 Director Group 1 [Member] 2008 Equity Incentive Plan [Member] Restricted Stock and Restricted Stock Units [Member]	Mar. 31, 2013 Employee [Member]	Mar. 31, 2013 Employee [Member] 2008 Equity Incentive Plan [Member] Restricted Stock and Restricted Stock Units [Member]	Mar. 31, 2013 Employee inducement (1) [Member]	Mar. 31, 2013 Employee inducement (1) [Member] 2008 Equity Incentive Plan [Member] Restricted Stock and Restricted Stock Units [Member]
Summary of nonvested stock awards granted
Grantee Type			Director group		Director group		Employee		Employee inducement (1)
No. of Shares Granted	0		7,122		17,092		5,000		20,000
Vesting Period		1 year or less	1 year or less
Vesting Period				3 years	3 years	3 years	3 years	3 years	3 years
Weighted Average Grant Date Fair Value		$ 2.35	$ 6.83	$ 3.76	$ 6.83	$ 3.65	$ 6.83	$ 3.81	$ 7.14