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Fair value measurements (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Marketable securities:
Fair Value	$ 39,504,263	$ 26,965,297
Corporate debt securities
Marketable securities:
Fair Value	11,418,230
U.S. government agency securities
Marketable securities:
Fair Value	28,086,033
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20,697,042	59,985,670
Marketable securities:
Total assets	60,201,305	86,950,967
Fair Value, Measurements, Recurring | Corporate debt securities
Marketable securities:
Fair Value	11,418,230	26,965,297
Fair Value, Measurements, Recurring | U.S. government agency securities
Marketable securities:
Fair Value	28,086,033
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20,697,042	58,575,348
Marketable securities:
Total assets	20,697,042	58,575,348
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities
Marketable securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency securities
Marketable securities:
Fair Value	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	1,410,322
Marketable securities:
Total assets	39,504,263	28,375,619
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities
Marketable securities:
Fair Value	11,418,230	26,965,297
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency securities
Marketable securities:
Fair Value	28,086,033
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Marketable securities:
Total assets	0	0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities
Marketable securities:
Fair Value	0	$ 0
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency securities
Marketable securities:
Fair Value	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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