Stock Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Summary of stock option plan
Outstanding at beginning of year, Shares	261,098		199,856
Outstanding at beginning of year, Weighted Average Exercise Price	$ 10.38
Outstanding at beginning of year, Weighted Average Remaining Contractual Life	6 years 10 months 24 days
Granted, shares	13,889
Granted, Weighted Average Exercise Price	$ 5.40
Granted, Weighted Average Remaining Contractual Life	9 years 7 months 6 days
Exercised, Shares	(2,250)
Exercised, Weighted Average Exercise Price	$ 3.50
Forfeited, Shares	(20,651)
Forfeited, Weighted Average Exercise Price	$ 13.98
Outstanding at end of period, Shares	252,086	261,098	199,856
Outstanding at end of period, Weighted Average Exercise Price	$ 9.87	$ 10.38
Outstanding at end of period, Weighted Average Remaining Contractual Life	6 years 10 months 24 days
Options exercisable at period end, Shares	118,333
Options exercisable at period end, Weighted Average Exercise Price	$ 16.39
Options exercisable at period end, Weighted Average Remaining Contractual Life	4 years 10 months 24 days
Option exercisable at period end, Aggregate Intrinsic value	$ 52
Weighted-average fair value of options granted	$ 1.73	$ 1.97
Outstanding at Ending of year, Aggregate Intrinsic Value	$ 188