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Stock-Based Compensation - Warrants (Details) - IPO - Warrants - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Jul. 17, 2017	Jul. 16, 2017	Jul. 21, 2014
Stock-Based Compensation
Warrants up to the number of shares, underwriters can purchase		0			201,600
Fair value of warrants					$ 611,000
Exercise price of IPO warrants (in dollars per share)			$ 2.42		$ 8.125
Exercise price expressed as a percent of original issue price					130.00%
Strike price (in dollars per share)			$ 10.05	$ 8.125
Fair value modification of IPO warrants recognized	$ 380,452
Warrants exercised		162,031

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Represents the information pertaining to the warrants' exercise price, expressed as a percent of share price.

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Exercise or strike price stated for Warrant.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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-Topic 235
-SubTopic 10
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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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