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Financing Instruments - Note Purchase Agreement - Enhanced Note (Details) - USD ($)
Sep. 07, 2016
Apr. 30, 2016
Apr. 21, 2016
Dec. 31, 2015
Dec. 10, 2013
Debt Instrument [Line Items]          
Repayments of debt   $ 2,000,000      
Secured Debt [Member] | Enhanced Texas Fund          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 1,500,000.0
Secured Debt [Member] | Enhanced Jobs for Texas          
Debt Instrument [Line Items]          
Maximum borrowing capacity         5,700,000.0
Secured Debt [Member] | Note Purchase Agreement          
Debt Instrument [Line Items]          
Maximum borrowing capacity         $ 7,200,000.0
Repayments of debt $ 5,800,000   $ 1,900,000    
Notes payable, noncurrent       $ 7,500,000  
Effective interest rate (percent)       25.60%