Investment in Enterworks (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012
Schedule of Equity-method Investments [Line Items]
Number of common shares underlying warrants	1,785,714
Diluted ownership percent (in hundredths)	8.20%
Investment, carrying value	$ 0
Series A-1 Preferred Stock [Member]
Schedule of Equity-method Investments [Line Items]
Number of shares owned (in shares)	729,732
Series B-1 Preferred Stock [Member]
Schedule of Equity-method Investments [Line Items]
Number of shares owned (in shares)	1,793,903
Series D Preferred Stock [Member]
Schedule of Equity-method Investments [Line Items]
Number of shares owned (in shares)	8,571,429
Common Stock [Member]
Schedule of Equity-method Investments [Line Items]
Number of shares owned (in shares)	671,301