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Preferred Stock and Common Stock Warrants (Tables) | 3 Months Ended
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Mar. 31, 2019
Preferred Stock and Common Stock Warrants |
Summary of assumptions used to estimate fair value |
|  | March 31, |  | December 31,
|  | 2019 |  |  | 2018
Stock price |  | $ | 5.52 |  |  | $ | 5.40 |
Exercise price |  | $ | 0.01 |  |  | $ | 0.01 |
Risk-free rate |  |  | 2.3 | % |  |  | 2.5 | %
Volatility |  |  | 29.2 | % |  |  | 33.1 | %
Term (years) |  |  | 2.5 |  |  |  | 2.7 |

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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