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Staff Retirement Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Employer matching contribution percent | 5.00% |  |
Cost of contribution to the staff retirement plans | $ 223 | $ 114 | $ 242
Hong Kong [Member] |  |  |
Mandatory provident fund, description | The MPF is available to all employees aged 18 to 64 with at least 60 days of service under the employment of the Group in Hong Kong. |  |

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- Definition Description of mandatory provident fund. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Balance Type: | na
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- Details
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