Commitments and Contingencies (Details 4) (USD $)	0 Months Ended
	Dec. 12, 2012	Nov. 30, 2012	Nov. 21, 2012	Aug. 07, 2012	Jun. 15, 2012	May 25, 2012
Commitments and Contingencies
Minimum number of consecutive business days for which a minimum specified market capitalization must be maintained in order to regain compliance	10 days			10 days
Number of consecutive business days for which the minimum specified market capitalization was not maintained					30 days
Period afforded to regain compliance with minimum market capitalization requirement					180 days
Minimum market capitalization maintained for continued listing on the Nasdaq Global Market	$ 50,000,000			$ 50,000,000	$ 50,000,000
Consecutive business period for which bid price for the company's common stock closed below minimum price						30 days
Minimum specified bid price required for continued inclusion on the Nasdaq Global Market (in dollars per share)			$ 1.00			$ 1.00
Period afforded to regain compliance with minimum bid price requirement						180 days
Period within which compliance was not regained with minimum bid price requirement			180 days
Additional period afforded to regain compliance with minimum bid price requirement		180 days
Minimum consecutive business period for which minimum specified bid price must be maintained in order to regain compliance						10 days