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Notes Payable - Warrants Calculated Using the Black Scholes Merton Pricing Model (Detail) | Dec. 31, 2018 $ / shares | Mar. 23, 2017 $ / shares shares
--- | --- | ---
Warrants calculated using the Black Scholes Merton pricing model |  |
Number of warrants | shares |  | 500,000
Exercise price |  | $ 2.26
Weighted-average fair value of warrants | $ 3.11 | $ 0.73
Expiration date |  | Nov. 13, 2022
Expected Volatility of Underlying Stock |  |
Warrants calculated using the Black Scholes Merton pricing model |  |
Warrants outstanding, measurement input | 0.74 | 0.72
Risk-Free Interest Rate |  |
Warrants calculated using the Black Scholes Merton pricing model |  |
Warrants outstanding, measurement input | 0.0162 | 0.0208
Dividend Yield |  |
Warrants calculated using the Black Scholes Merton pricing model |  |
Warrants outstanding, measurement input | 0.00 | 0.00
Expected Life of Warrants |  |
Warrants calculated using the Black Scholes Merton pricing model |  |
Expected life of warrants | 8 years | 5 years

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- Definition Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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