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Fair Value Measurements - Additional Information (Detail) | 1 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) | Jun. 30, 2014 USD ($) $ / shares | Jul. 31, 2013 USD ($) $ / shares | Dec. 31, 2019 USD ($) shares | Aug. 09, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Nov. 01, 2018 $ / shares | Jul. 26, 2018 USD ($) | Nov. 07, 2017 | Aug. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Principal/ Fair Value Amount |  |  |  | $ 52,658,000 |  | $ 140,974,000 |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  | 200,000 | 200,000 | 0 |  |  |  |
3.25% Convertible Senior Notes Due 2020 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Principal/ Fair Value Amount |  |  |  | $ 0 |  | $ 27,974,000 |  | $ 8,000,000.0 |  |
Debt instrument, interest rate |  |  |  | 3.25% |  |  |  | 3.25% |  |
4.875% Convertible Senior Notes Due 2020 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Principal/ Fair Value Amount |  | $ 115,000,000 |  | $ 1,905,000 | $ 113,000,000 | 113,000,000 |  |  |  |
Debt instrument, interest rate | 4.875% | 4.875% |  | 4.875% |  |  |  |  |  |
Debt instrument, conversion price (in dollars per share) | $ / shares |  | $ 9.64 |  |  |  |  |  |  |  |
Debt conversion ratio |  | 0.1037613 |  |  |  |  |  |  |  |
Convertible senior note payable, fair value |  |  |  | $ 1,700,000 |  | 93,200,000 |  |  |  |
3.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Principal/ Fair Value Amount |  |  |  | $ 50,753,000 |  | $ 0 |  |  |  |
Debt instrument, interest rate | 3.25% |  |  | 3.25% |  |  |  | 3.25% |  |
Interest rate if paid in cash | 3.25% |  |  |  |  |  |  |  |  |
Interest rate if paid in stock | 5.00% |  |  |  |  |  |  |  |  |
Paid in kind interest rate | 2.75% |  |  |  |  |  |  |  |  |
Debt conversion ratio | 1.00 |  |  |  |  |  |  |  |  |
Debt prepayment percentage | 105.00% |  |  |  |  |  |  |  |  |
4.25% Convertible Senior Notes Due 2018 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Principal/ Fair Value Amount |  |  | $ 100,000,000.0 |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 4.25% | 4.25% |  |  |  | 4.25% |  | 4.25%
Debt instrument, conversion price (in dollars per share) | $ / shares |  |  | $ 8.74 |  |  |  |  |  |  |
Debt conversion ratio |  |  | 0.1143674 |  |  |  |  |  |  |
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible Senior Notes Due 2020 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Principal/ Fair Value Amount | $ 21,600,000 |  |  |  |  |  |  | $ 8,000,000 |  | $ 21,600,000
Debt instrument, conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 2.54 |  |  |
Oasis Management and Oasis Investments ll Master Fund Ltd. | 3.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Principal/ Fair Value Amount | $ 8,000,000 |  |  |  |  |  |  |  |  |
Oasis Management and Oasis Investments ll Master Fund Ltd. | After Modification Senior Notes (due 2018) |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  | 3.25% |
Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  |  | 200,000 |  |  |  |  |

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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + 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(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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