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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Proceeds Investment Agreement	$ 6,240,000	$ 9,142,000
Level 1 [Member]
Proceeds Investment Agreement
Level 2 [Member]
Proceeds Investment Agreement
Level 3 [Member]
Proceeds Investment Agreement	$ 6,240,000	$ 9,142,000

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- Definition

Proceeds investment agreement, at fair value.

+ References

No definition available.

+ Details

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