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Intangible Assets, Redeemable Common Units and Mezzanine Equity (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2007
patent
Intangible Assets, Redeemable Common Units and Mezzanine Equity    
Number of patents | patent   3
Cash payment upon execution of agreement | $ $ 1,000  
On-going quarterly cash payments | $ $ 25  
Current commercial price paid for the first 24 modules sold to commercial customers (as a percent) 0.25%  
Number of modules sold under first commercial scale | item 24  
Current commercial price paid for the next 12 modules sold to commercial customers (as a percent) 0.15%  
Number of modules sold under subsequent commercial scale | item 12