Convertible Senior Notes - Convertible Notes Equity Component (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Proceeds allocated to the conversion feature	$ 52,062
Less: transaction costs allocated to the conversion feature	(1,621)
Less: deferred taxes	12,353
Net carrying value	$ 38,088

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Name:	us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant