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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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Upfront payment received.

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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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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Gross amount of debt extinguished.

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Per share or per unit amount of equity securities issued.

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Borrowings - Facility Financing Obligation (2019 Notes and Tranche B Notes) - Additional Information (Detail)														1 Months Ended		3 Months Ended	9 Months Ended
	Oct. 18, 2018 USD ($)	Sep. 26, 2018 USD ($)	Sep. 05, 2018 USD ($) shares	Jul. 12, 2018 USD ($) $ / 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	Sep. 30, 2018 USD ($) shares	Aug. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)	Oct. 16, 2018 USD ($)	Sep. 07, 2018 $ / shares	Sep. 06, 2018 $ / shares	Jun. 07, 2018 USD ($) $ / shares	Mar. 09, 2018 $ / shares	Dec. 31, 2017 USD ($) shares	Jul. 01, 2013 USD ($)
Debt Instrument [Line Items]
Principal amount														$ 104,700,000		$ 104,700,000	$ 104,700,000
Loss on extinguishment of debt																712,000	765,000	$ 830,000
Cash and cash equivalents														$ 10,446,000		$ 10,446,000	$ 10,446,000									$ 43,946,000
Common stock, shares issued \| shares														159,497,573		159,497,573	159,497,573									119,053,414
Milestone rights liability, noncurrent														$ 7,202,000		$ 7,202,000	$ 7,202,000									$ 7,201,000
Common Stock
Debt Instrument [Line Items]
Number of shares sold in underwritten public offering \| shares											973,236
Senior convertible notes due December 31, 2019
Debt Instrument [Line Items]
Principal amount														12,000,000		12,000,000	12,000,000
Conversion of notes to common shares, value							$ 1,300,000
Exchange price per share \| $ / shares							$ 2.83					$ 1.45	$ 1.22
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 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														14,495,000		14,495,000	14,495,000									54,407,000
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 \| Ninth Amendment to Facility Agreement
Debt Instrument [Line Items]
Exchange price per share \| $ / shares																						$ 1.78	$ 2.04
Loss on extinguishment of debt																700,000	$ 700,000
Debt discount and issuance costs			$ 300,000
Deerfield \| Tenth Amendment to Facility Agreement
Debt Instrument [Line Items]
Debt instrument, payment terms description																	further defer the payment of $3.0 million in principal amount of 2019 notes from September 30, 2018 until the earlier of October 31, 2018 or the first business day following the date the Company receives an upfront payment of $45.0 million from United Therapeutics
Available amount of credit facility under covenant restrictions for each quarter end after current fiscal		$ 25,000,000
Deerfield \| Tenth Amendment to Facility Agreement \| Subsequent Event \| United Therapeutics Corporation
Debt Instrument [Line Items]
Upfront payment received																					$ 45,000,000
Deerfield \| Minimum \| Tenth Amendment to Facility Agreement \| Scenario Forecast
Debt Instrument [Line Items]
Available amount of credit facility under covenant restrictions																			$ 20,000,000
Deerfield \| Minimum \| Tenth Amendment to Facility Agreement \| Subsequent Event
Debt Instrument [Line Items]
Available amount of credit facility under covenant restrictions																				$ 20,000,000
Deerfield \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount														20,000,000		20,000,000	$ 20,000,000
Deerfield \| Tranche B Notes \| Facility Agreement Eighth Amendment \| Notes Due and Payable on December 31, 2019
Debt Instrument [Line Items]
Principal amount				$ 2,000,000
Conversion of notes to common shares, value				$ 2,000,000
Deerfield \| Tranche B Notes \| Ninth Amendment to Facility Agreement
Debt Instrument [Line Items]
Conversion of notes to common shares, value			2,500,000
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										$ 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										$ 90,000,000
Deerfield \| Senior convertible notes due December 31, 2019
Debt Instrument [Line Items]
Principal amount														120,000,000		120,000,000	120,000,000
Milestone rights liability, noncurrent														7,200,000		7,200,000	7,200,000									7,200,000
Remaining milestone rights liability														8,800,000		8,800,000	8,800,000									8,800,000
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									$ 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
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
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement															$ 3,000,000
Common stock, shares issued \| shares				7,367,839
Deerfield \| Senior convertible notes due December 31, 2019 \| Facility Agreement Eighth Amendment \| Notes Due and Payable on July 18, 2018
Debt Instrument [Line Items]
Principal amount				$ 10,000,000
Conversion of notes to common shares, value				7,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Facility Agreement Eighth Amendment \| Notes Due and Payable on December 31, 2019
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 \| Ninth Amendment to Facility Agreement
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement														3,000,000
Conversion of notes to common shares, value			$ 8,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Tenth Amendment to Facility Agreement
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement		$ 3,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Tenth Amendment to Facility Agreement \| Subsequent Event
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement	$ 3,000,000
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
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
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
Available amount of credit facility under covenant restrictions for each quarter end after current fiscal														$ 25,000,000		$ 25,000,000	$ 25,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Notes \| Minimum \| Scenario Forecast
Debt Instrument [Line Items]
Available amount of credit facility under covenant restrictions																			$ 20,000,000
Deerfield \| Senior convertible notes due December 31, 2019 \| Tranche B Notes \| Minimum \| Subsequent Event
Debt Instrument [Line Items]
Available amount of credit facility under covenant restrictions																				$ 20,000,000
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]
Principal amount					$ 5,000,000
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 \| 2019 Notes and Tranche B Notes \| Ninth Amendment to Facility Agreement \| Common Stock
Debt Instrument [Line Items]
Conversion Option, shares \| shares			5,749,500
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