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Share-Based Payments - Summary of option activity under the equity plans (Details) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Shares
Exercised	(2,000)	(12,000)
Forfeited	(8,000)	(67,000)
Equity Plans
Shares
Outstanding at March 31, 2019	72,000
Granted	0
Exercised	(2,000)
Forfeited	(8,000)
Outstanding at March 31, 2020	62,000	72,000
Exercisable at March 31, 2020	57,000
Weighted Average Exercise Price
Outstanding at March 31, 2019	$ 10.71
Granted	0
Exercised	3.49
Forfeited	12.02
Outstanding at March 31, 2020	11.67	$ 10.71
Exercisable at March 31, 2020	$ 10.63
Weighted Average Remaining Contractual Term
Outstanding at March 31	3 years 1 month 17 days	4 years 1 month 6 days
Exercisable at March 31, 2020	2 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding at March 31		$ 51

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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