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Cash, Cash Equivalents and Short-Term Investments - Schedule of Cash and Cash Equivalents and Short-term Investments by Significant Investment Category (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash | $ 2,215,116 | $ 3,040,696 |  |
Short term investments Gross Unrealized Gain (Loss) | (3,545) | (16,907) |  |
Short term investments | 18,765,236 | 21,287,064 |  |
Cash and cash equivalents and Short term investments, Amortized Cost | 31,833,437 | 36,330,039 |  |
Cash and cash equivalents and Short term investments, Estimated Fair Value | 31,829,892 | 36,313,132 |  |
Cash and cash equivalents | 13,064,656 | 15,026,068 | $ 18,165,647 | $ 45,161,403
Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short term investments Gross Unrealized Gain (Loss) | 89 | (5,540) |  |
Cash equivalents and Short term investments, Estimated Fair Value | 8,838,138 | 10,720,010 |  |
Cash equivalents and Short term investments, Amortized Cost | 8,838,049 | 10,725,550 |  |
Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 3,000,542 | 3,750,621 |  |
Short term investments Gross Unrealized Gain (Loss) | (3,634) | (11,367) |  |
Short term investments | 17,776,096 | 18,801,805 |  |
Cash equivalents and Short term investments, Estimated Fair Value | 20,776,638 | 22,552,426 |  |
Cash equivalents and Short term investments, Amortized Cost | 20,780,272 | 22,563,793 |  |
Money Market Funds | Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 7,848,998 | 8,234,751 |  |
Repurchase Agreements | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 3,000,542 | 3,000,233 |  |
US Treasury Securities | Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short Term Investments Amortized Cost | 989,051 | 2,490,799 |  |
Short term investments Gross Unrealized Gain (Loss) | 89 | (5,540) |  |
Short term investments | 989,140 | 2,485,259 |  |
Commercial Paper | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short Term Investments Amortized Cost | 8,531,479 | 9,716,093 |  |
Short term investments | 8,531,479 | 9,716,093 |  |
Cash equivalents and Short term investments, Estimated Fair Value | 8,531,479 |  |  |
Corporate Debt Securities | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short Term Investments Amortized Cost | 5,936,106 | 6,829,191 |  |
Short term investments Gross Unrealized Gain (Loss) | (2,008) | (9,414) |  |
Short term investments | 5,934,098 | 6,819,777 |  |
Asset-backed Securities | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents |  | 750,388 |  |
Short Term Investments Amortized Cost | 3,312,145 | 3,018,276 |  |
Short term investments Gross Unrealized Gain (Loss) | (1,626) | (1,953) |  |
Short term investments | 3,310,519 | 2,265,935 |  |
Cash equivalents and Short term investments, Estimated Fair Value | $ 3,310,519 | $ 3,016,323 |  |

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