Restructuring (Details) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2012
Restructuring [Abstract]
Restructuring accrual of severance and related benefits		$ 1,900,000	$ 1,300,000
Restructuring Charges Amount Payable In Common Stock Value	1,200,000			1,200,000
Restructuring Charges Amount Payable In Common Stock Shares	174			174
Restructuring costs paid with common stock	100,000
Activity in restructuring accrual [Roll Forward]
Balance at beginning of period				731,000
Additions, net				2,092,000
Payments				(2,010,000)
Balance at end of period	813,000		731,000	813,000
Severance and Related Benefits [Member]
Activity in restructuring accrual [Roll Forward]
Balance at beginning of period				571,000
Additions, net				1,905,000
Payments				(1,663,000)
Balance at end of period	813,000			813,000
Other Exit Costs [Member]
Activity in restructuring accrual [Roll Forward]
Balance at beginning of period				6,000
Additions, net				184,000
Payments				(190,000)
Balance at end of period	0			0
Contract Termination Costs [Member]
Activity in restructuring accrual [Roll Forward]
Balance at beginning of period				154,000
Additions, net				3,000
Payments				(157,000)
Balance at end of period	$ 0			$ 0