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Fair Value Measurement - Additional Information (Detail) - USD ($)	Jul. 19, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 24, 2016
Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents, at Carrying Value		$ 208,888,000		$ 193,822,000
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash and Cash Equivalents, at Carrying Value		118,400,000		126,600,000
2.125% Convertible Senior Notes due 2021
Summary Of Significant Accounting Policies [Line Items]
Principal amount	$ 92,000,000.0		$ 17,000		$ 11,000	$ 115,000,000.0
Total convertible senior notes		105,704,000		$ 103,488,000
Fair value of convertible senior notes		$ 310,500,000

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