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Debt - Summary of Convertible Senior Notes (Detail) - USD ($)	Sep. 30, 2019	Aug. 09, 2019	Dec. 31, 2018	Jul. 26, 2018	Aug. 31, 2017	Jun. 30, 2014
Debt Instrument [Line Items]
Principal/ Fair Value Amount	$ 50,540,000		$ 140,974,000
Debt Issuance Costs	0		1,182,000
Net Amount	50,540,000		139,792,000
4.875% convertible senior notes due 2020
Debt Instrument [Line Items]
Principal/ Fair Value Amount	1,905,000	$ 111,100,000	113,000,000
Debt Issuance Costs	0		1,182,000
Net Amount	$ 1,905,000		111,818,000
Debt instrument, interest rate	4.875%					4.875%
3.25% convertible senior notes due 2020
Debt Instrument [Line Items]
Principal/ Fair Value Amount	$ 0		27,974,000
Debt Issuance Costs	0		0
Net Amount	$ 0		$ 27,974,000
Debt instrument, interest rate	3.25%		3.25%	3.25%	3.25%
3.25% convertible senior notes due 2023
Debt Instrument [Line Items]
Principal/ Fair Value Amount	$ 48,635,000		$ 0
Debt Issuance Costs	0		0
Net Amount	$ 48,635,000		0
Debt instrument, interest rate	3.25%
Accrued paid-in-kind interest	$ 100,000
Carrying Amount \| 3.25% convertible senior notes due 2020
Debt Instrument [Line Items]
Long term debt	0		29,600,000
Carrying Amount \| 3.25% convertible senior notes due 2023
Debt Instrument [Line Items]
Long term debt	$ 37,600,000		$ 0