Fair Value Measurements - Schedule of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
|
Jun. 30, 2018 |
Dec. 31, 2017 |
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total short-term investments |
$ 160,547,550
|
$ 78,083,604
|
| Fair Value, Measurements, Recurring |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
94,397,188
|
44,181,756
|
| Total short-term investments |
160,547,550
|
78,083,604
|
| Total financial assets |
254,944,738
|
122,265,360
|
| Fair Value, Measurements, Recurring | Money Market Mutual Funds |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
35,781,822
|
44,181,756
|
| Fair Value, Measurements, Recurring | Asset-backed Securities |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total short-term investments |
20,159,772
|
7,421,703
|
| Fair Value, Measurements, Recurring | Commercial Paper |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
32,876,471
|
|
| Total short-term investments |
53,019,143
|
34,882,298
|
| Fair Value, Measurements, Recurring | Corporate Debt Securities |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
5,643,984
|
|
| Total short-term investments |
58,467,890
|
26,856,283
|
| Fair Value, Measurements, Recurring | U.S Treasury Securities |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
20,094,911
|
|
| Total short-term investments |
28,900,745
|
8,923,320
|
| Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
35,781,822
|
44,181,756
|
| Total financial assets |
35,781,822
|
44,181,756
|
| Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Mutual Funds |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
35,781,822
|
44,181,756
|
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
58,615,366
|
|
| Total short-term investments |
160,547,550
|
78,083,604
|
| Total financial assets |
219,162,916
|
78,083,604
|
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed Securities |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total short-term investments |
20,159,772
|
7,421,703
|
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commercial Paper |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
32,876,471
|
|
| Total short-term investments |
53,019,143
|
34,882,298
|
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Debt Securities |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
5,643,984
|
|
| Total short-term investments |
58,467,890
|
26,856,283
|
| Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S Treasury Securities |
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
| Total cash equivalents |
20,094,911
|
|
| Total short-term investments |
$ 28,900,745
|
$ 8,923,320
|