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Equity Incentive Plans - Company's Equity Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 5 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 07, 2019 | May 22, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares granted |  |  | 885,000 |
Share based compensation |  |  | $ 2,857 | $ 5,011
Total unrecognized compensation cost relating to restricted share awards |  |  | 5,195 |
Total unrecognized compensation cost relating to non-vested share option |  |  | $ 116 |
Weighted average remaining term for non-vested restricted share awards |  |  | 10 months 21 days |
Weighted average remaining term for non-vested share option awards |  |  | 9 months 15 days |
Restricted Share Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total shares authorized | 4,000,000 |  |  |
Vesting rights | Each RSU represents, upon vesting, a right for the relevant beneficiary to receive one common share of the Company. |  |  |
Restricted Share Units (RSUs) | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fleet performance indices |  |  | $ 120,000 |
Restricted Share Units (RSUs) | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fleet performance indices |  |  | $ 300,000 |
Tranche One | Restricted Share Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting date |  |  | Apr. 30, 2021 |
Shares expected to vest |  |  | 2,000,000 |
Tranche Two | Restricted Share Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting date |  |  | Apr. 30, 2022 |
Shares expected to vest |  |  | 2,000,000 |
2019 Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance |  | 900,000 |  |
Number of shares granted |  | 885,000 |  |
Grant date fair value |  | $ 8.13 |  |
2019 Equity Incentive Plan | Vest in August 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted common shares expected to vest |  |  | 685,462 |
2019 Equity Incentive Plan | Vest in August 2020 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted common shares expected to vest |  |  | 99,769 |
2019 Equity Incentive Plan | Vest in August 2022 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted common shares expected to vest |  |  | 99,769 |

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- Definition The fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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