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Summary of Principal Payment Settlement in Cash or Exchange for Issuance of Shares (Detail) - Deerfield $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Notes Due and Payable on July, 2016 | 2019 notes
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement	$ 5.0
Notes Due and Payable on April, 2017 | 2019 notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	5.0
Notes Due and Payable on April, 2017 | Tranche B notes
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement	4.0
Conversion of notes to common shares, value	1.0
Notes Due and Payable on June, 2017 | 2019 notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	5.0
Notes Due and Payable on November, 2017 | 2019 notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	5.6
Notes Due and Payable on January, 2018 | 2019 notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	3.2
Notes Due and Payable on March, 2018 | 2019 notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	1.3
Notes Due and Payable on March, 2018 | Tranche B notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	5.0
Notes Due and Payable on June, 2018 | 2019 notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	3.0
Notes Due and Payable on June, 2018 | Tranche B notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	3.0
Notes Due and Payable on July, 2018 | 2019 notes
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement	2.0
Conversion of notes to common shares, value	10.0
Notes Due and Payable on July, 2018 | Tranche B notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	2.0
Notes Due and Payable on September, 2018 | 2019 notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	8.0
Notes Due and Payable on September, 2018 | Tranche B notes
Debt Instrument [Line Items]
Conversion of notes to common shares, value	2.5
Notes Due and Payable on October, 2018 | 2019 notes
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement	3.0
Notes Due and Payable on May, 2019 | Tranche B notes
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement	2.5
Notes Due and Payable on July, 2019 | 2019 notes
Debt Instrument [Line Items]
Cash repayment of senior notes under exchange agreement	2.4
Conversion of notes to common shares, value	$ 1.6

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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