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Issuance of Common Stock, Warrants and Convertible Preferred Stock (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Schedule of Issuance of Convertible Preferred Stock |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Number of shares |  |  |  |  |  |  |
|  | Shares |  |  | Shares Issued and |  |  | Net |  |  | Conversion |  |  | of common stock |  |  | Liquidation |  |  | Liquidation |
|  | Authorized |  |  | Outstanding |  |  | Proceeds |  |  | Price/Share |  |  | Equivalents |  |  | Preference |  |  | Value/Share |
Series A |  |  | 3,000 |  |  |  | 50 |  |  | $ | 49,426 |  |  | $ | 4.50 |  |  |  | 11,111 |  |  | $ | 125,000 |  |  | $ | 2,500 |
| The following table provides various information about the Series A convertible preferred stock.
|  |  |  |  | Shares |  |  |  |  |  |  |  |  | Number of shares |  |  |  |  |  |  |
|  | Shares |  |  | Issued and |  |  | Net |  |  | Conversion |  |  | of common stock |  |  | Liquidation |  |  | Liquidation |
|  | Authorized |  |  | Outstanding |  |  | Proceeds |  |  | Price/Share |  |  | Equivalents |  |  | Preference |  |  | Value/Share |
Series A convertible preferred stock |  |  | 3,000 |  |  |  | 50 |  |  | $ | 38,932 |  |  | $ | 4.50 |  |  |  | 11,112 |  |  | $ | 125,000 |  |  | $ | 2,500 |
Schedule of Weighted-average Assumptions Used in Black-Scholes Valuation Method | The following weighted-average assumptions were used in the Black-Scholes valuation model for options granted during the three months ended March 31, 2017:
Risk-free interest rate |  |  | 1.60 | %
Expected term (in years) |  |  | 7.25 |
Dividend yield |  |  | - |
Expected volatility |  |  | 75 | %
Warrant [Member] |  |
Schedule of Weighted-average Assumptions Used in Black-Scholes Valuation Method | Black-Scholes option-pricing model using the weighted-average assumptions below:
Volatility |  |  | 75 | %
Risk-free interest rate |  |  | 1.50 | %
Expected term (in years) |  |  | 3.0 |
Expected dividend yield |  |  | - |
Fair value of common stock |  | $ | 4.38 |
Volatility |  |  | 75 | %
Risk-free interest rate |  |  | 1.03 | %
Expected term (in years) |  |  | 3.0 |
Expected dividend yield |  |  | - |
Fair value of common stock |  | $ | 5.04 |
Summary of Warrant Activity | A summary of activity in warrants is as follows:
|  | Warrants |  |  | Weighted Average Remaining Life |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2016 |  |  | 846,765 |  |  |  | 2.77 years |  |  | $ | 6.48 |  |  | $ | — |
Three months ended March 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | 192,308 |  |  |  | 3.00 years |  |  | $ | 7.50 |  |  | $ | 0 |
Exercised |  |  | (40,834 | ) |  |  | 2.00 years |  |  | $ | 3.90 |  |  |  |  |
Forfeited and cancelled |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding at March 31, 2017 |  |  | 998,239 |  |  |  | 2.61 years |  |  | $ | 6.75 |  |  | $ | 0 |
| A summary of activity in warrants is as follows:
|  | Warrants |  |  | Weighted Average Remaining Life |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2015 |  |  | — |  |  |  | — |  |  | $ | — |  |  | $ | — |
Granted |  |  | 1,435,639 |  |  |  |  |  |  | $ | 6.18 |  |  | $ | - |
Exercised |  |  | (483,773 | ) |  |  |  |  |  |  | 3.90 |  |  |  |  |
Forfeited and cancelled |  |  | (105,101 | ) |  |  |  |  |  |  | 6.00 |  |  |  | - |
Outstanding at December 31, 2016 |  |  | 846,765 |  |  |  | 2.77 years |  |  | $ | 6.48 |  |  | $ | - |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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