Stock-based Compensation and Stockholders' Equity - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 27, 2022	Feb. 28, 2021	Feb. 27, 2022	Feb. 28, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 622	$ 797	$ 1,928	$ 2,584
Cost of product sales | Continuing operations:
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	83	141	177	262
Cost of product sales | Discontinued Operations:
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	0	(34)	25	27
Research and development | Continuing operations:
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	51	49	151	175
Selling, general and administrative | Continuing operations:
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 488	$ 641	$ 1,575	$ 2,120