Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 18,649	$ 37,100
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefit, end of year	9,653	9,143	$ 8,770
Gross increases to tax positions for prior periods	438	20	257
Gross decreases to tax positions for prior periods	(6,210)	(70)	(482)
Gross increases to tax positions for current period	13,543	560	598
Gross unrecognized tax benefit, beginning of year	$ 17,424	$ 9,653	$ 9,143

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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