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

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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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.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Borrowings - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Oct. 23, 2017
Debt Instrument [Line Items]
Principal amount	$ 129,200
Tranche B Notes
Debt Instrument [Line Items]
Principal amount	$ 7,000
Senior notes, effective interest rate	8.75%
5.75% Senior convertible notes due October 23, 2021
Debt Instrument [Line Items]
Principal amount	$ 18,690	$ 23,690	$ 23,700
Senior notes, effective interest rate	5.75%		5.75%
Maturity date	Oct. 23, 2021
Senior convertible notes due December 31, 2019
Debt Instrument [Line Items]
Principal amount	$ 32,000
Senior notes, effective interest rate	9.75%
Senior convertible notes due December 31, 2019 \| Notes Due and Payable On July 2018
Debt Instrument [Line Items]
Principal amount	$ 12,000
Senior convertible notes due December 31, 2019 \| Notes Due and Payable On July 2019
Debt Instrument [Line Items]
Principal amount	15,000
Senior convertible notes due December 31, 2019 \| Notes Due and Payable On December 2019
Debt Instrument [Line Items]
Principal amount	5,000
Senior convertible notes due December 31, 2019 \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount	39,000	$ 54,407
Notes Due and Payable On May 2019 \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount	5,000
Notes Due and Payable On December 2019 \| Tranche B Notes
Debt Instrument [Line Items]
Principal amount	$ 2,000