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Income taxes - Schedule of Deferred Tax Assets and Liabilities Within the Same Jurisdiction (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |  |
Deferred tax assets | $ 15 | $ 25 | $ 56
Deferred tax liabilities | 21,892 | 16,753 | 20,217
Net deferred tax liabilities | $ 21,877 | $ 16,728 | $ 20,161

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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