Subsequent Events (Details) (Subsequent Event [Member], Gemma Power Inc [Member], Moxie Liberty LLC [Member], USD $)	1 Months Ended
Aug. 31, 2013
Subsequent Event [Member] \| Gemma Power Inc [Member] \| Moxie Liberty LLC [Member]
Subsequent Events (Textual) [Abstract]
Cash received from Moxie Liberty in respect of sale of membership interest to third party investor	$ 19,373,000
Cash received from Moxie Liberty in respect of development success fees	14,245,000
Cash received from Moxie Liberty for repayment of notes receivable and accrued interest	$ 5,128,000

Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

No definition available.

Name:	us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration