Stockholders' Equity - Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stock-Based Compensation
Stock-based compensation expense	$ 1,245	$ 937
Cost of goods sold
Stock-Based Compensation
Stock-based compensation expense	109	83
Research and development
Stock-Based Compensation
Stock-based compensation expense	79	41
Selling, general and administrative
Stock-Based Compensation
Stock-based compensation expense	$ 1,057	$ 813