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Schedule of Common Stock Shares Reserved for Issuance and Shares Available for Grant (Detail) - shares | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
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Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Shares of common stock reserved for issuance under the plans | 3,973,228 | 3,048,877 |
Shares of common stock available for future grants | 2,325,102 | 1,891,231 |
Predecessor |  |  |
Compensation Related Costs Share Based Payments Disclosure [Line Items] |  |  |
Shares of common stock reserved for issuance under the plans |  |  | 1,900,769
Shares of common stock available for future grants |  |  | 505,221

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- Definition Compensation Related Costs Share Based Payments Disclosure [Line Items] + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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