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SIGNIFICANT ACCOUNTING POLICIES - Amortized Cost Basis, Aggregate Fair Value, Unrealized (Gains)/Losses and Net Carrying Value of Investments in Held-to-maturity Securities (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Schedule Of Held To Maturity Securities [Line Items]
Marketable securities, Amortized Cost	$ 48,556,558	$ 37,762,439
Marketable securities, Aggregate Fair Value	48,568,165	37,757,896
Marketable securities, Unrealized Gains		4,543
Marketable securities, Unrealized Losses	(11,607)
Marketable securities, Net Carrying Value	48,556,558	37,762,439
Corporate Bonds/Notes
Schedule Of Held To Maturity Securities [Line Items]
Marketable securities, Amortized Cost	10,823,308	16,054,071
Marketable securities, Aggregate Fair Value	10,832,228	16,050,462
Marketable securities, Unrealized Gains		3,609
Marketable securities, Unrealized Losses	(8,920)
Marketable securities, Net Carrying Value	10,823,308	16,054,071
Commercial Paper
Schedule Of Held To Maturity Securities [Line Items]
Marketable securities, Amortized Cost	25,819,617	17,756,394
Marketable securities, Aggregate Fair Value	25,819,617	17,756,394
Marketable securities, Net Carrying Value	25,819,617	17,756,394
U.S. government Agency Securities
Schedule Of Held To Maturity Securities [Line Items]
Marketable securities, Amortized Cost	11,913,633	3,951,974
Marketable securities, Aggregate Fair Value	11,916,320	3,951,040
Marketable securities, Unrealized Gains		934
Marketable securities, Unrealized Losses	(2,687)
Marketable securities, Net Carrying Value	$ 11,913,633	$ 3,951,974

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

+ References

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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