Stock-Based Compensation (Details 1) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Options
Options outstanding at beginning of period	139,446	144,370	144,370
Granted	5,507	19,412
Canceled / forfeited	(8,090)	(17,699)
Expired	(10,806)	(8,110)
Options outstanding at end of period	126,057	137,973	139,446	144,370
Options exercisable at end of period	88,151	56,711
Weighted- average exercise price
Options outstanding at beginning of period	$ 53.39	$ 68.90	$ 68.90
Granted	$ 6.80	$ 4.25
Canceled / forfeited	$ 110.67	$ 69.11
Expired	$ 90.72	$ 68.97
Options outstanding at end of period	$ 44.78	$ 59.77	$ 53.39	$ 68.90
Options exercisable at beginning of period	$ 61.43	$ 137.74
Weighted-average remaining contractual term (years), Options outstanding	6 years 6 months	6 years 3 months 18 days	6 years 2 months 12 days	5 years 10 months 24 days
Weighted-average remaining contractual term (years), Option Granted	9 years 8 months 12 days	1 year 10 months 24 days
Weighted-average remaining contractual term (years), Options exercisable	5 years 4 months 24 days	3 years 7 months 6 days
Aggregate intrinsic value outstanding at beginning of year	$ 79,400	$ 0	$ 0
Aggregate intrinsic value Granted	$ 0	$ 27,800
Aggregate intrinsic value outstanding at end of year	40,900	27,800	79,400	0
Aggregate intrinsic value exercisable	$ 27,300	$ 0