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Borrowings - Facility Financing Obligation (2019 Notes and Tranche B Notes) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended	24 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2014	Dec. 31, 2014	Mar. 31, 2019	Dec. 31, 2018	Jul. 01, 2013
Debt Instrument [Line Items]
Principal amount					$ 101,700
Milestone rights liability					7,201	$ 7,201
2019 notes
Debt Instrument [Line Items]
Principal amount					9,000
Facility Financing Obligation
Debt Instrument [Line Items]
Principal amount					11,495	11,495
Tranche B notes
Debt Instrument [Line Items]
Principal amount					2,500
Deerfield | Minimum
Debt Instrument [Line Items]
Available amount of credit facility under covenant restrictions for each quarter end after current fiscal						25,000
Deerfield | 2019 notes
Debt Instrument [Line Items]
Principal amount							$ 160,000
Debt instrument, remaining borrowing capacity					60,000
Deerfield | Facility Financing Obligation
Debt Instrument [Line Items]
Conversion of notes to common shares, value				$ 100,000
Debt instrument, remaining borrowing capacity					80,000
Remaining milestone rights liability					8,900	8,900
Milestone rights liability					7,200	$ 7,200
Deerfield | Facility Financing Obligation | Scenario Forecast
Debt Instrument [Line Items]
Required payment for milestone liability	$ 5,000	$ 5,000
Deerfield | Facility Financing Obligation | Accrued Expenses and Other Current Liabilities
Debt Instrument [Line Items]
Milestone rights liability, current					1,600
Deerfield | Tranche B notes
Debt Instrument [Line Items]
Debt instument additional borrowing capacity			$ 20,000
Debt instrument, remaining borrowing capacity					$ 20,000

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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