Summary of Significant Accounting Policies - Intangibles and Goodwill (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Impairment of finite-lived intangible assets	$ 0	$ 0
Carrying value of intangible assets	7,925,000	8,328,000
Accumulated amortization of intangible assets	3,165,000	1,762,000
Amortization of intangible assets	1,403,000	607,000	$ 459,000
Amortization expense, next twelve months	1,482,000
Amortization expense, year two	1,478,000
Amortization expense, year three	1,437,000
Amortization expense, year four	1,437,000
Amortization expense, year five	1,201,000
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