Share-Based Compensation - Options (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Shares
Options outstanding, beginning balance (in shares)	234,959	1,250
Granted (in shares)	145,221	234,959	0
Exercised (in shares)	0	(1,250)
Options outstanding, ending balance (in shares)	380,180	234,959	1,250
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share)	$ 22.31	$ 9.69
Granted (in dollars per share)	31.99	22.31
Exercised (in dollars per share)	0	9.69
Options outstanding, ending balance (in dollars per share)	$ 26.01	$ 22.31	$ 9.69
Options outstanding, aggregate intrinsic value	$ 7,087,000	$ 867,000
Options outstanding, weighted average remaining contractual term	8 years 7 months 6 days	9 years 3 months
Options Vested and Exercisable
Number of shares (in shares)	78,326
Weighted average exercise price (in dollars per share)	$ 22.31
Options vested and exercisable, aggregate intrinsic value	$ 0
Options vested and exercisable, weighted average remaining contractual term	0 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected option term	6 years	6 years
Expected stock price volatility	39.87%	33.02%
Expected dividend yield	0.00%	0.00%
Risk-free interest rate	2.46%	2.62%

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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