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Cash, Cash Equivalents and Short-Term Investments - Summary of Short-term Investments with Unrealized Losses (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Cash And Cash Equivalents And Short Term Investments [Line Items]
Less Than 12 Months, Estimated Fair Value	$ 10,043,047
Less Than 12 Months, Unrealized Losses.	(21,043)
US Treasury Securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Less Than 12 Months, Estimated Fair Value	2,487,004
Less Than 12 Months, Unrealized Losses.	(5,660)
Corporate Debt Securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Less Than 12 Months, Estimated Fair Value	4,542,071
Less Than 12 Months, Unrealized Losses.	(9,610)
Asset-backed Securities
Cash And Cash Equivalents And Short Term Investments [Line Items]
Less Than 12 Months, Estimated Fair Value	3,013,972
Less Than 12 Months, Unrealized Losses.	$ (5,773)

X

- Definition

Cash and cash equivalents and short-term investments.

+ References

No definition available.

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- Definition

Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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