Stock-Based Compensation (2019 Stock Plan Activity) (Details) - 2019 Stock Plan - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of shares granted
Beginning balance (in shares)	6,122,044	0
Granted (in shares)	334,894	6,212,609
Exercised (in shares)	0	0
Forfeited (in shares)	114,516	90,565
Ending balance (in shares)	6,342,422	6,122,044	0
Options exercisable at December 31, 2019 (in shares)	0
Weighted- average exercise price
Weighted-average exercise price, beginning balance (in dollars per share)	$ 11.58	$ 0
Granted (in dollars per share)	13.87	11.58
Exercised (in dollars per share)		0
Forfeited (in dollars per share)	11.79	11.79
Weighted-average exercise price, ending balance (in dollars per share)	11.69	$ 11.58	$ 0
Options exercisable at December 31, 2019 (in dollars per share)	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, weighted average contractual term		9 years 9 months 29 days	0 years
Options exercisable, weighted average contractual term	9 years 6 months 21 days
Options outstanding, aggregate intrinsic value		$ 0	$ 0
Options exercisable, aggregate intrinsic value	$ 0

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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 number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross 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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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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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 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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