Joint Venture - Summary of Financial Information of Joint Ventures (Operations Data) (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020
Schedule Of Equity Method Investments [Line Items]
Total net revenue	$ 107,442		$ 85,332
Gross Profit	39,524		35,403
Net income (loss)	$ (1,028)		$ 402
CNNC Accuray (Tianjin) Medical Technology Co. Ltd.
Schedule Of Equity Method Investments [Line Items]
Total net revenue		$ 7,669		$ 3,917
Gross Profit		2,340		1,184
Net income (loss)		(693)		(58)
Net loss attributable to the Company		$ (340)		$ (28)