Series F Amount (Details) (USD $)	0 Months Ended		3 Months Ended	12 Months Ended
	Oct. 06, 2010	Nov. 02, 2007	Dec. 31, 2010	Dec. 31, 2010
Convertible preferred stock
Accrued noncash interest expense recorded as additional paid-in capital				$ 12,974,000
Series F preferred stock
Convertible preferred stock
Shares intended to be authorized under the 2007 Restated Articles		11,776,000
Imputed noncash interest expense				3,673,000
Number of shares issued	11,776,000
Initial investment recorded as convertible preferred stock (in dollars per share)	$ 5.10
Accrued noncash interest expense recorded as additional paid-in capital			$ 12,974,000