Summary of Significant Accounting Policies - Weighted Average Shares Outstanding for Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Earnings per share — Basic:
Net income	$ 9,515	$ 7,498	$ 24,494
Weighted-average shares outstanding — Basic	66,739	65,474	64,417
Net income per common share — Basic	$ 0.14	$ 0.11	$ 0.38
Earnings per share — Diluted:
Net income	$ 9,515	$ 7,498	$ 24,494
Weighted-average shares outstanding — Basic	66,739	65,474	64,417
Effect of potentially dilutive securities	146	138	183
Weighted-average shares outstanding — Diluted	66,885	65,612	64,600
Net income per common share — Diluted	$ 0.14	$ 0.11	$ 0.38