Quarterly report pursuant to Section 13 or 15(d)

Fair Value (Details)

v3.10.0.1
Fair Value (Details) - Recurring
Sep. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets $ 115,621,690
Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 14,881,346
U.S. government securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 17,865,780
Corporate bonds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 65,873,445
Asset-backed securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 17,001,119
Quoted Prices in Active Markets for Identical Assets (Level 1)  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 32,747,126
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 14,881,346
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 17,865,780
Significant Other Observable Inputs (Level 2)  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 82,874,564
Significant Other Observable Inputs (Level 2) | Corporate bonds  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets 65,873,445
Significant Other Observable Inputs (Level 2) | Asset-backed securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total assets $ 17,001,119