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Fair Value - Fair Value Hierarchy (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Assets:
Government bonds and notes	$ 4,880,876	$ 7,173,037
Assets, Fair Value Disclosure	11,144,490	14,504,042
Money Market Funds And Corporate Bonds [Member]
Assets:
Cash equivalents - money market funds and corporate bonds	6,263,614	7,331,005
Government [Member]
Assets:
Government bonds and notes	849,923	897,381
Corporate Bonds, Notes and Commercial Paper [Member]
Assets:
Government bonds and notes	4,030,953	6,275,656
Level 1 inputs [Member]
Assets:
Assets, Fair Value Disclosure	6,314,837	5,732,814
Level 1 inputs [Member] | Money Market Funds And Corporate Bonds [Member]
Assets:
Cash equivalents - money market funds and corporate bonds	5,464,914	4,835,433
Level 1 inputs [Member] | Government [Member]
Assets:
Government bonds and notes	849,923	897,381
Level 1 inputs [Member] | Corporate Bonds, Notes and Commercial Paper [Member]
Assets:
Government bonds and notes	0	0
Level 2 inputs [Member]
Assets:
Assets, Fair Value Disclosure	4,829,653	8,771,228
Level 2 inputs [Member] | Money Market Funds And Corporate Bonds [Member]
Assets:
Cash equivalents - money market funds and corporate bonds	798,700	2,495,572
Level 2 inputs [Member] | Government [Member]
Assets:
Government bonds and notes	0	0
Level 2 inputs [Member] | Corporate Bonds, Notes and Commercial Paper [Member]
Assets:
Government bonds and notes	4,030,953	6,275,656
Level 3 inputs [Member]
Assets:
Assets, Fair Value Disclosure	0	0
Level 3 inputs [Member] | Money Market Funds And Corporate Bonds [Member]
Assets:
Cash equivalents - money market funds and corporate bonds	0	0
Level 3 inputs [Member] | Government [Member]
Assets:
Government bonds and notes	0	0
Level 3 inputs [Member] | Corporate Bonds, Notes and Commercial Paper [Member]
Assets:
Government bonds and notes	$ 0	$ 0

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
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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.

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