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Fair Value Measurement - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 05, 2018 | Jan. 05, 2015 | Dec. 31, 2017 | Mar. 31, 2018 | Dec. 07, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Conversion price of common stock | $ 1.35 |  |  |  |
Variance from fair value of derivative |  |  | $ 28.2 |  |
Fair market value of derivative liability transferred to equity |  |  | $ 108.9 |  |
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Capital |  | $ 600.0 |  |  |
Redeemable Convertible preferred stock, shares issued |  | 600,000 | 600,000 | 600,000 |
Preferred stock liquidation preference per share |  | $ 1,000 |  |  |
Preferred stock dividend rate calculated on interest rate |  | 3.00% |  |  |
Percentage of dividend payable in common stock accrued | 5.00% |  |  |  |
Conversion ceiling price of common stock |  |  |  | $ 2.25 |
Conversion floor price of common stock |  |  |  | 1.75 | $ 1.75
Conversion price of common stock | $ 1.35 |  |  |  |
Fair market value of derivative liability transferred to equity |  |  | $ 108.9 |  |
Redeemable Convertible Series B Preferred Stock [Member] | Maximum [Member] |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Conversion ceiling price of common stock |  |  |  | $ 2.25 |

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- Definition The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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