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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, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
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Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Cash | $ 1,309,876 |  |  |
Short term investments Gross Unrealized Losses | (1,696) |  |  |
Short term investments | 18,463,148 |  |  |
Cash and cash equivalents and Short term investments, Amortized Cost | 36,630,491 |  |  |
Cash and cash equivalents and Short term investments, Estimated Fair Value | 36,628,795 |  |  |
Cash and cash equivalents | 18,165,647 | $ 45,161,403 | $ 16,826,304 | $ 5,335,913
Level 1 |  |  |  |
Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Short term investments Gross Unrealized Losses | (88) |  |  |
Cash equivalents and Short term investments, Amortized Cost | 15,090,401 |  |  |
Cash equivalents and Short term investments, Estimated Fair Value | 15,090,313 |  |  |
Level 2 |  |  |  |
Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Short term investments Gross Unrealized Losses | (1,608) |  |  |
Short term investments | 17,228,423 |  |  |
Cash equivalents and Short term investments, Amortized Cost | 20,230,214 |  |  |
Cash equivalents and Short term investments, Estimated Fair Value | 20,228,606 |  |  |
Money Market Funds | Level 1 |  |  |  |
Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Cash equivalents | 13,855,588 |  |  |
Repurchase Agreements | Level 2 |  |  |  |
Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Cash equivalents | 3,000,183 |  |  |
Commercial Paper | Level 2 |  |  |  |
Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Short Term Investments Amortized Cost | 10,430,502 |  |  |
Short term investments | 10,430,502 |  |  |
Corporate Debt Securities | Level 2 |  |  |  |
Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Short Term Investments Amortized Cost | 6,049,066 |  |  |
Short term investments Gross Unrealized Losses | (1,458) |  |  |
Short term investments | 6,047,608 |  |  |
US Treasury Securities | Level 1 |  |  |  |
Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Short Term Investments Amortized Cost | 1,234,813 |  |  |
Short term investments Gross Unrealized Losses | (88) |  |  |
Short term investments | 1,234,725 |  |  |
Asset-backed Securities | Level 2 |  |  |  |
Cash, Cash Equivalents and Short-Term Investments [Line Itmes] |  |  |  |
Short Term Investments Amortized Cost | 750,463 |  |  |
Short term investments Gross Unrealized Losses | (150) |  |  |
Short term investments | $ 750,313 |  |  |

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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