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Shareholders Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
|
Nov. 15, 2013
Common Class A
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Jun. 03, 2013
Common Class A
|
Dec. 31, 2013
Common Class A
Vote
|
Dec. 31, 2012
Common Class A
|
Dec. 31, 2011
Common Class A
Riverside Renewable Energy Investments
|
Dec. 31, 2013
Common Class A
First Issuance
|
Dec. 31, 2013
Common Class A
Second Issuance
|
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| Class of Stock [Line Items] | ||||||||
| Common stock shares issued for service rendered | 5,900,000 | 3,400,000 | 18,517 | 33,056 | ||||
| Issued common stock and received proceeds | $ 27,333 | $ 18,400 | $ 8,400 | |||||
| Issued warrants to purchase to purchase common stock | 5,000,000 | 1,700,000 | ||||||
| Warrants exercise price | 3.41 | 2.60 | 2.50 | |||||
| Common stock, expiry date | May 15, 2019 | Jun. 03, 2018 | ||||||
| Class A common stock, entitled vote | 1 | |||||||
| Ownership percentage of Class A common stock | 22.00% | |||||||