Restatement of Previously Issued Financial Statements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2010
Accrued income taxes, noncurrent	$ 504	$ 661
Accumulated deficit	(75,267)	(76,372)	(78,326)
As previously reported
Accrued income taxes, noncurrent		1,101
Accumulated deficit		(76,812)	(78,766)
Effect of restatement
Accrued income taxes, noncurrent		(440)
Accumulated deficit		$ 440	$ 440

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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