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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) - Fair Value, Measurements [Member]
Jun. 30, 2016
USD ($)
Financial assets:  
Total financial assets $ 1,238,339
Financial liabilities:  
Total financial liabilities 591,037
Money market funds [Member] | Cash equivalents [Member]  
Financial assets:  
Total financial assets 573,239
U.S. Treasury debt obligations [Member] | Cash equivalents [Member]  
Financial assets:  
Total financial assets 665,100
Warrants [Member]  
Financial liabilities:  
Total financial liabilities 591,037
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]  
Financial assets:  
Total financial assets 1,238,339
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member]  
Financial assets:  
Total financial assets 573,239
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member]  
Financial assets:  
Total financial assets 665,100
Significant Other Observable Inputs (Level 2) [Member]  
Financial liabilities:  
Total financial liabilities 591,037
Significant Other Observable Inputs (Level 2) [Member] | Warrants [Member]  
Financial liabilities:  
Total financial liabilities $ 591,037