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Summary of Significant Accounting Policies - Intangibles and Goodwill (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Impairment of finite-lived intangible assets | $ 0 | $ 0 |  |
Carrying value of intangible assets | 8,328,000 | 2,562,000 |  |
Accumulated amortization of intangible assets | 1,762,000 | 1,155,000 |  |
Amortization of intangible assets | 607,000 | 459,000 | $ 326,000 |
Amortization expense, next twelve months | 1,324,000 |  |  |
Amortization expense, year two | 1,324,000 |  |  |
Amortization expense, year three | 1,320,000 |  |  |
Amortization expense, year four | 1,279,000 |  |  |
Amortization expense, year five | 1,279,000 |  |  |
Goodwill | $ 3,943,000 | $ 3,943,000 |  |
Goodwill impairment |  |  |  | $ 0
Customer Relationships | Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible asset useful life | 7 years |  |  |
Customer Relationships | Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible asset useful life | 10 years |  |  |

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