Common Stock, Percentage of Voting Rights Pledged as Collateral

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Debt Instrument, Convertible Debt, Ownership Cap for Holder

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Debt Instrument, Convertible, Default Terms, Percentage of Ownership

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- Definition

Debt Instrument, Maximum Increase to Initial Conversion Rate

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Initial Conversion, Premium Over Closing Price

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Convertible Notes - Additional Information (Detail)	1 Months Ended	3 Months Ended		6 Months Ended		9 Months Ended
Convertible Notes - Additional Information (Detail)	Mar. 31, 2015	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($)	Sep. 30, 2014 USD ($) $ / shares
Debt Instrument [Line Items]
Aggregate amount of senior notes issued		$ 125,000,000		$ 125,000,000
Debt instrument, anniversary term				7 years
Debt instrument, convertible, ownership cap in shares of common stock (as a percentage)		9.985%		9.985%
Convertible notes
Debt Instrument [Line Items]
Aggregate amount of senior notes issued		$ 125,000,000		$ 125,000,000
Debt instrument, interest rate percentage						1.75%
Debt instrument, convertible, stock price trigger (in dollars per share) \| $ / shares						$ 30
Debt instrument, convertible, threshold trading days						30 days
Debt instrument, transaction fee						$ 600,000
Reimbursed expenses incurred by Deerfield in connection with transaction						300,000
Legal and advisory fees						$ 1,300,000
Debt instrument, convertible, ownership cap in shares of common stock (as a percentage)		9.985%		9.985%
Debt instrument, convertible, initial conversion price per share (in dollars per share) \| $ / shares		$ 24.80		$ 24.80
Debt instrument, convertible, common stock conversion rate per $1,000 principal amount				0.04032
Debt instrument, convertible, conversion premium percentage		30.00%		30.00%
Debt instrument, convertible, maximum increase to the initial conversion rate per $1,000 principal amount (in shares) \| shares		0.01207		0.01207
Debt instrument, convertible, ownership percentage threshold necessary to declare principal and accrued interest payable (more than)		50.00%		50.00%
Unamortized debt discounts and debt issuance cost		$ (1,300,000)		$ (1,300,000)
Interest expense related to convertible notes		$ 500,000	$ 500,000	$ 1,000,000	$ 1,100,000
Subsidiaries \| Convertible notes
Debt Instrument [Line Items]
Business acquisition, percentage of voting interests acquired	65.00%