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Fair Value of Financial Instruments - (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair value of the Company's financial assets
Assets transferred from level 1 to level 2	$ 0	$ 0	$ 0
Assets transferred from level 2 to level 1	$ 0	0	0
Carrying Amount
Fair value of the Company's financial assets
Money market funds (cash equivalents)		5,000,000	1,000,000
Fair Value
Fair value of the Company's financial assets
Money market funds (cash equivalents)		5,000,000	1,000,000
Fair Value | Quoted Prices in Active Markets (Level 1)
Fair value of the Company's financial assets
Money market funds (cash equivalents)		$ 5,000,000	$ 1,000,000

X

- 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

No definition available.

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ 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
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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- References

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