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Subsequent Event (Details) - USD ($)
$ in Millions
Jul. 17, 2017
Jul. 31, 2017
Dec. 23, 2016
NY Green Bank      
Subsequent Events      
Loan Amount     $ 25.0
Subsequent event      
Subsequent Events      
Increase in term loan facility   $ 20.0  
Subsequent event | Walmart Transaction Agreement      
Subsequent Events      
Shares of common stock that can be purchased from warrants issued 55,286,696    
Proceeds from Issuance of Warrants $ 13.6    
Subsequent event | NY Green Bank      
Subsequent Events      
Loan Amount   45.0  
Increase in term loan facility   $ 20.0