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Contingent liability remaining payable amount.

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Deferred payment of credit facility.

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Milestone rights liabilities current.

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Milestone rights liabilities current and noncurrent.

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Milestone rights liabilities noncurrent.

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Payment For Contingent Liabilities

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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

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

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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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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Borrowings - Facility Financing Obligation (2019 Notes and Tranche B Notes) - Additional Information (Detail)											1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 12, 2018 USD ($) $ / shares shares	Jun. 08, 2018 USD ($) $ / shares shares	Mar. 12, 2018 USD ($) shares	Mar. 06, 2018 USD ($) d $ / shares shares	Jan. 18, 2018 USD ($) d $ / shares shares	Jan. 15, 2018 USD ($)	Nov. 06, 2017 USD ($) $ / shares shares	Oct. 23, 2017 USD ($) d $ / shares shares	Jun. 29, 2017 USD ($) $ / shares shares	Apr. 18, 2017 USD ($) $ / shares shares	Aug. 31, 2018 USD ($)	Feb. 28, 2015 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Jun. 07, 2018 USD ($) $ / shares	Mar. 09, 2018 $ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Jul. 01, 2013 USD ($)
Debt Instrument [Line Items]
Principal amount													$ 129,200,000		$ 129,200,000
Gain (Loss) on extinguishment of debt													772,000	$ (830,000)	(53,000)	$ (830,000)
Cash and cash equivalents													$ 26,178,000		$ 26,178,000				$ 43,946,000
Common stock, shares issued \| shares													145,619,293		145,619,293				119,053,414
Common stock, par value \| $ / shares													$ 0.01		$ 0.01				$ 0.01
Milestone rights liability, noncurrent													$ 7,201,000		$ 7,201,000				$ 7,201,000
Interest expense on notes												$ 5,800,000	1,709,000	$ 2,422,000	3,503,000	$ 5,128,000
Required payment pursuant to the terms of the Milestone Agreement												$ 10,000,000
Common Stock
Debt Instrument [Line Items]
Number of shares sold in underwritten public offering \| shares								973,236
Tranche B Notes
Debt Instrument [Line Items]
Principal amount													$ 7,000,000		$ 7,000,000
Senior notes, effective interest rate													8.75%		8.75%
Senior convertible notes due December 31, 2019
Debt Instrument [Line Items]
Principal amount													$ 32,000,000		$ 32,000,000
Conversion of notes to common shares, value				$ 1,300,000
Exchange price per share \| $ / shares				$ 2.83					$ 1.45	$ 1.22
Gain (Loss) on extinguishment of debt									$ (500,000)
Cash repayment										$ 4,000,000
Debt extinguishment amount									5,000,000
Debt discount and issuance costs									300,000
Number of trading days \| d				3
Senior notes, effective interest rate													9.75%		9.75%
Senior convertible notes due December 31, 2019 \| Common Stock
Debt Instrument [Line Items]
Conversion Option, shares \| shares				441,618
Senior convertible notes due December 31, 2019 \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount													$ 39,000,000		$ 39,000,000				54,407,000
Gain (Loss) on extinguishment of debt										(300,000)
2019 Notes and Tranche B Notes \| Fourth Amendment to Facility Agreement
Debt Instrument [Line Items]
Deferred payment of credit facility principal amount								$ 10,000,000
Deerfield \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount													20,000,000		20,000,000
Deerfield \| Tranche B Exchange Shares
Debt Instrument [Line Items]
Conversion of notes to common shares, value			$ 5,000,000
Conversion Option, shares \| shares			1,838,236
Exchange price per share \| $ / shares																		$ 2.72
Deerfield \| Milestone Rights Liability
Debt Instrument [Line Items]
Contingent liability for milestone payments, remain payable amount													75,000,000		75,000,000						$ 75,000,000
Deerfield \| Milestone Rights Liability \| Maximum
Debt Instrument [Line Items]
Contingent liability for milestone payments													90,000,000		90,000,000						$ 90,000,000
Deerfield \| Senior convertible notes due December 31, 2019
Debt Instrument [Line Items]
Principal amount													120,000,000		120,000,000
Milestone rights liability, noncurrent													7,200,000		7,200,000				7,200,000
Remaining milestone rights liability													$ 8,800,000		$ 8,800,000				8,800,000
Senior notes, effective interest rate													9.75%		9.75%
Deerfield \| Senior convertible notes due December 31, 2019 \| Accrued Expenses and Other Current Liabilities
Debt Instrument [Line Items]
Milestone rights liability, current													$ 1,600,000		$ 1,600,000				$ 1,600,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Fifth Amendment to Facility Agreement
Debt Instrument [Line Items]
Deferred payment of credit facility principal amount						$ 4,400,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Sixth Amendment to Facility Agreement
Debt Instrument [Line Items]
Conversion of notes to common shares, value					$ 3,200,000
Exchange price per share \| $ / shares					$ 2.49
Deferred payment of credit facility principal amount					$ 1,300,000
Common stock, shares issued \| shares					1,267,972
Common stock, par value \| $ / shares					$ 0.01
Deerfield \| Senior convertible notes due December 31, 2019 \| Seventh Amendment to Facility Agreement
Debt Instrument [Line Items]
Conversion Option, shares \| shares		3,061,224
Exchange price per share \| $ / shares		$ 1.96
Cash and cash equivalents		$ 20,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Seventh Amendment to Facility Agreement \| 2019 Notes Due And Payable On July 1, 2018
Debt Instrument [Line Items]
Principal amount		5,000,000
Conversion of notes to common shares, value		$ 3,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Facility Agreement Third Amendment
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement									10,000,000
Conversion of notes to common shares, value									$ 5,000,000
Conversion Option, shares \| shares									3,584,230
Exchange price per share \| $ / shares									$ 1.395
Cash and cash equivalents									$ 10,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Facility Agreement Eighth Amendment \| Subsequent Event
Debt Instrument [Line Items]
Common stock, shares issued \| shares	7,367,839
Deerfield \| Senior convertible notes due December 31, 2019 \| Minimum \| Seventh Amendment to Facility Agreement
Debt Instrument [Line Items]
Cash and cash equivalents																	$ 25,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Minimum \| Facility Agreement Third Amendment
Debt Instrument [Line Items]
Cash and cash equivalents									$ 25,000,000											$ 10,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Minimum \| Facility Agreement Eighth Amendment \| Common Stock \| Subsequent Event
Debt Instrument [Line Items]
Conversion price of shares \| $ / shares	$ 1.80
Deerfield \| Senior convertible notes due December 31, 2019 \| Maximum \| Facility Agreement Eighth Amendment \| Common Stock \| Subsequent Event
Debt Instrument [Line Items]
Conversion Option, shares \| shares	5,750,000
Conversion price of shares \| $ / shares	$ 2.01
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Notes
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement										4,000,000
Conversion of notes to common shares, value										$ 1,000,000
Senior notes, effective interest rate													8.75%		8.75%
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Exchange Shares
Debt Instrument [Line Items]
Conversion Option, shares \| shares										869,565
Exchange price per share \| $ / shares										$ 1.15
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Exchange Shares \| Fourth Amendment to Facility Agreement
Debt Instrument [Line Items]
Conversion of notes to common shares, value							$ 5,600,000
Conversion Option, shares \| shares							1,720,846
Conversion price of shares \| $ / shares							$ 3.25
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Exchange Shares \| Sixth Amendment to Facility Agreement
Debt Instrument [Line Items]
Number of trading days \| d					3
Conversion price of shares \| $ / shares					$ 2.75
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Exchange Shares \| Seventh Amendment to Facility Agreement
Debt Instrument [Line Items]
Conversion price of shares \| $ / shares		$ 2.01															$ 2.75
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Exchange Shares \| Seventh Amendment to Facility Agreement \| Tranche B Notes Due and Payable on December 31, 2019
Debt Instrument [Line Items]
Conversion of notes to common shares, value		$ 3,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Exchange Shares \| Common Stock \| Sixth Amendment to Facility Agreement
Debt Instrument [Line Items]
Number of shares sold in underwritten public offering \| shares					10,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Exchange Shares \| Maximum \| Seventh Amendment to Facility Agreement
Debt Instrument [Line Items]
Conversion Option, shares \| shares		9,558,382
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche 1 Notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value										$ 5,000,000
Conversion Option, shares \| shares										4,347,826
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche 4 Notes \| Facility Agreement Eighth Amendment \| Scenario Forecast
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement											$ 3,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche 4 Notes \| Facility Agreement Eighth Amendment \| Notes Due and Payable on December 31, 2019 \| Subsequent Event
Debt Instrument [Line Items]
Principal amount	$ 5,000,000
Conversion of notes to common shares, value	3,000,000
Deerfield \| 2019 Notes and Tranche B Notes \| Tranche B Exchange Shares \| Fourth Amendment to Facility Agreement
Debt Instrument [Line Items]
Number of trading days \| d								3
Conversion price of shares \| $ / shares								$ 3.25
Deerfield \| 2019 Notes and Tranche B Notes \| Tranche B Exchange Shares \| Maximum \| Common Stock \| Fourth Amendment to Facility Agreement
Debt Instrument [Line Items]
Number of shares sold in underwritten public offering \| shares								4,000,000
Deerfield \| 9.75% Senior Convertible Notes Due 2019 \| Tranche 4 Notes \| Facility Agreement Eighth Amendment \| Notes Due and Payable on July 18, 2018 \| Subsequent Event
Debt Instrument [Line Items]
Principal amount	10,000,000
Conversion of notes to common shares, value	$ 7,000,000
Senior notes, effective interest rate	9.75%
Deerfield \| 8.75% Senior Convertible Notes Due 2019 \| Facility Agreement Eighth Amendment \| Notes Due and Payable on December 31, 2019 \| Subsequent Event
Debt Instrument [Line Items]
Principal amount	$ 2,000,000
Conversion of notes to common shares, value	$ 2,000,000
Senior notes, effective interest rate	8.75%