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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 ($) | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash | $ 2,472,787 | $ 3,040,696 |  |
Short term investments Gross Unrealized Losses | (7,950) | (16,907) |  |
Short term investments | 18,817,655 | 21,287,064 |  |
Cash and cash equivalents and Short term investments, Amortized Cost | 32,084,962 | 36,330,039 |  |
Cash and cash equivalents and Short term investments, Estimated Fair Value | 32,077,012 | 36,313,132 |  |
Cash and cash equivalents | 13,259,357 | 15,026,068 | $ 36,582,992 | $ 45,161,403
Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short term investments Gross Unrealized Losses | (2,297) | (5,540) |  |
Cash equivalents and Short term investments, Estimated Fair Value | 7,265,247 | 10,720,010 |  |
Cash equivalents and Short term investments, Amortized Cost | 7,267,544 | 10,725,550 |  |
Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 6,019,931 | 3,750,621 |  |
Short term investments Gross Unrealized Losses | (5,653) | (11,367) |  |
Short term investments | 16,319,047 | 18,801,805 |  |
Cash equivalents and Short term investments, Estimated Fair Value | 22,338,978 | 22,552,426 |  |
Cash equivalents and Short term investments, Amortized Cost | 22,344,631 | 22,563,793 |  |
Money Market Funds | Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 4,766,639 | 8,234,751 |  |
Repurchase Agreements | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 3,000,329 | 3,000,233 |  |
US Treasury Securities | Level 1 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Short Term Investments Amortized Cost | 2,500,905 | 2,490,799 |  |
Short term investments Gross Unrealized Losses | (2,297) | (5,540) |  |
Short term investments | 2,498,608 | 2,485,259 |  |
Commercial Paper | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 2,246,170 |  |  |
Short Term Investments Amortized Cost | 9,701,381 | 9,716,093 |  |
Short term investments | 7,455,211 | 9,716,093 |  |
Cash equivalents and Short term investments, Estimated Fair Value | 9,701,381 |  |  |
Corporate Debt Securities | Level 2 |  |  |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |  |  |
Cash equivalents | 773,432 |  |  |
Short Term Investments Amortized Cost | 5,323,767 | 6,829,191 |  |
Short term investments Gross Unrealized Losses | (2,059) | (9,414) |  |
Short term investments | 5,321,708 | 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 | 4,319,154 | 3,018,276 |  |
Short term investments Gross Unrealized Losses | (3,594) | (1,953) |  |
Short term investments | 4,315,560 | 2,265,935 |  |
Cash equivalents and Short term investments, Estimated Fair Value | $ 4,315,560 | $ 3,016,323 |  |

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