Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Feb. 20, 2012 Revolving Credit Facility Wells Fargo Bank
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity					$ 20.0
Debt instrument, basis spread on variable rate		1.00%
Debt covenant, minimum current ratio		1.5
Debt covenant, maximum quarterly operating loss, quarter one	6.5
Debt covenant, maximum quarterly operating loss, quarter two		11.0
Debt covenant, maximum quarterly operating loss, quarter three			13.0
Debt covenant, maximum quarterly operating loss, quarter four				$ 13.0