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Class A Redeemable Convertible Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 22, 2016 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 29, 2016 | Dec. 30, 2015
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary equity, shares issued |  | 6,864,000 |  | 6,864,000 |  |
Temporary equity, face value (in dollars per share) |  | $ 0.001 |  | $ 0.001 |  |
Temporary equity, shares outstanding |  | 6,864,000 |  | 6,864,000 |  |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary equity, shares issued |  |  |  |  |  | 14,666,667
Temporary equity, face value (in dollars per share) | $ 7.50 |  |  |  |  | $ 7.50
Temporary equity, liquidation value | $ 49.5 |  |  |  |  | $ 110.0
Temporary equity liquidation amount at redemption |  |  |  |  | $ 100.0 |
Temporary equity shares redemption | 8,066,667 |  |  |  |  |
Temporary equity redemption amount | $ 55.0 |  |  |  |  |
Temporary equity, redemption per share (in dollars per share) | $ 6.82 |  |  |  |  |
Redemption discounts percentage | 9.09% |  |  |  |  |
Temporary equity, shares outstanding |  | 6,864,000 |  |  |  |
Temporary equity, carrying amount |  | $ 35.5 |  | $ 32.6 |  |
Temporary equity, accrual of deemed dividends |  | 0.8 |  |  |  |
Temporary equity accretion of beneficial conversion feature |  | 1.9 |  |  |  |
Temporary equity, fair value | $ 32.9 |  |  |  |  | $ 73.2
Temporary equity issued, price per share (in dollars per share) | $ 4.99 |  |  |  |  | $ 4.99
Temporary equity issue discount | $ 16.6 |  |  |  |  | $ 36.8
Temporary equity, value of beneficial conversion feature | $ 20.1 |  |  |  |  | $ 44.7
Temporary equity, recognized amount of beneficial conversion feature |  | 1.9 |  |  |  |
Series A Redeemable Convertible Preferred Stock | Payment In Kind Period Two |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary equity, shares issued |  |  |  | 264,000 |  |
Temporary equity additional beneficial conversion feature discount value |  | 0.2 |  |  |  |
Temporary equity, fair value |  | $ 49.5 |  |  |  |
Series A Redeemable Convertible Preferred Stock | Payment In Kind Period Two | Scenario, Forecast |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary equity, face value (in dollars per share) |  |  | $ 7.50 |  |  |
Temporary equity, fair value |  |  | $ 49.5 |  |  |
Additional preferred stock to be issued as paid in kind dividends |  |  | 274,560 |  |  |
Payment-in-kind dividend rate per annum in effect |  |  | 4.00% |  |  |

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- Definition The aggregate 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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