| Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Mar. 31, 2020 | 
|---|---|---|
| Finite Lived Intangible Assets [Line Items] | ||
| Cost | $ 54,897 | $ 54,897 | 
| Accumulated Amortization | (13,026) | (11,015) | 
| Net | 41,871 | 43,882 | 
| Developed technology | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Cost | 7,926 | 7,926 | 
| Accumulated Amortization | (6,101) | (5,861) | 
| Net | 1,825 | 2,065 | 
| Customer relationships | ||
| Finite Lived Intangible Assets [Line Items] | ||
| Cost | 46,971 | 46,971 | 
| Accumulated Amortization | (6,925) | (5,154) | 
| Net | $ 40,046 | $ 41,817 | 
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. No definition available. 
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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