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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 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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