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Carrying Amounts and Fair Values of Company's Financial Instruments (Detail) - Warranty Liability
Mar. 31, 2017
USD ($)
Liabilities  
Financial Liabilities Fair Value Disclosure $ 2,811,111
Fair Value, Inputs, Level 1  
Liabilities  
Financial Liabilities Fair Value Disclosure 0
Fair Value, Inputs, Level 2  
Liabilities  
Financial Liabilities Fair Value Disclosure 0
Fair Value, Inputs, Level 3  
Liabilities  
Financial Liabilities Fair Value Disclosure $ 2,811,111