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Common Stock, Voting Rights, Number of Votes

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Payments Of Stock Issuance Costs Other

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Payments Of Stock Issuance Costs Underwriting Discounts and Commissions

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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Cash received on stock transaction after deduction of issuance costs.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Number of new stock issued during the period.

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Shareholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended				12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares	Feb. 28, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) shares	May 31, 2017 $ / shares shares	Dec. 31, 2018 vote $ / shares
Class of Stock [Line Items]
Proceeds from follow-on public offering, net of issuance costs	$ 394,704	$ 646,984	$ 560,057
Public offering price per share (in dollars per share) \| $ / shares	$ 154.00	$ 137.00		$ 91.00	$ 154.00
Stock issuance costs	$ 5,696	$ 10,616
Underwriting discounts and commissions			14,390
Other offering expenses			$ 1,128
Class A Subordinate Voting
Class of Stock [Line Items]
Voting rights (in votes per share) \| vote					1
Class B Multiple Voting
Class of Stock [Line Items]
Voting rights (in votes per share) \| vote					10
Voting shares convertible (per share)					1
IPO
Class of Stock [Line Items]
Issuance of stock (in shares) \| shares				5,500,000
IPO \| Class A Subordinate Voting
Class of Stock [Line Items]
Issuance of stock (in shares) \| shares	2,600,000	4,800,000
Over-Allotment Option
Class of Stock [Line Items]
Issuance of stock (in shares) \| shares			825,000