Subsequent events(Details) (USD $)				12 Months Ended	0 Months Ended		1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Restricted stock	Jul. 26, 2011 Philip Beck Restricted stock Restricted stock with performance goals	Jan. 02, 2014 Subsequent event Restricted stock	Feb. 28, 2014 Subsequent event Philip Beck	Feb. 28, 2014 Subsequent event Philip Beck Restricted stock
Subsequent events
Aggregate gross amount payable under separation agreement							$ 370,000
Period of base salary under separation agreement							12 months
Advance payments of bonus returnable under separation agreement							$ 120,000
Restricted shares granted				875,583	915,000
Restricted shares repurchased (as a percent)								35.00%
Restricted shares repurchased								320,250
Restricted shares repurchase price	$ 2.78	$ 3.48	$ 2.27					$ 1.00
Awards cancelled due to the applicable performance targets not being fulfilled				9,000		416,239