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Share-Based Compensation - Schedule of restricted stock and RSU activity (Details) - $ / shares	1 Months Ended	12 Months Ended
	Oct. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted stock units
Number of Shares of Restricted Stock
Unvested, beginning balance (in shares)		149,004	0
Granted (in shares)		244,752	173,196
Vested (in shares)		99,970	23,552
Cancelled/Forfeited (in shares)		(17,797)	(640)
Unvested, ending balance (in shares)		275,989	149,004	0
Weighted Average Grant Date Fair Value Per Share
Unvested, beginning balance (in dollars per share)		$ 132.73	$ 0
Granted (in dollars per share)		109.61	126.29
Vested/Released (in dollars per share)		127.71	84.84
Cancelled/Forfeited (in dollars per share)		0	0
Unvested, ending balance (in dollars per share)		$ 114.99	$ 132.73	$ 0
Restricted Stock
Number of Shares of Restricted Stock
Unvested, beginning balance (in shares)		88,988	100,127	0
Granted (in shares)	135,791	0	99,433	135,791
Vested (in shares)		76,804	87,239	35,664
Cancelled/Forfeited (in shares)		0	(23,333)	0
Unvested, ending balance (in shares)		12,184	88,988	100,127
Weighted Average Remaining Contractual Life (Years)
Weighted Average Remaining Contractual Life, Unvested (Years)		3 months 18 days	1 year 2 months 12 days	1 year 7 months 6 days
Weighted Average Grant Date Fair Value Per Share
Unvested, beginning balance (in dollars per share)		$ 19.49	$ 17.03	$ 0
Granted (in dollars per share)		0	20.02	17.03
Vested/Released (in dollars per share)		19.97	19.21	17.03
Cancelled/Forfeited (in dollars per share)		0	0	0
Unvested, ending balance (in dollars per share)	$ 17.03	$ 20.02	$ 19.49	$ 17.03

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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