Balance Sheet Components (Details) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2012
Accounts receivable, net
Accounts receivable	$ 64,422,000		$ 64,422,000		$ 69,285,000
Unbilled fees and services	373,000		373,000		305,000
Accounts and other receivable, gross	64,795,000		64,795,000		69,590,000
Less: Allowance for doubtful accounts	(1,327,000)		(1,327,000)		(1,700,000)
Accounts receivable, net	63,468,000		63,468,000		67,890,000
Financing receivables
Accounts receivable with contractual maturities of more than one year	2,900,000		2,900,000		2,500,000
Inventories
Raw materials	38,071,000		38,071,000		34,579,000
Work-in-process	21,644,000		21,644,000		16,547,000
Finished goods	29,115,000		29,115,000		30,567,000
Total inventories	88,830,000		88,830,000		81,693,000
Property and Equipment, net
Property and equipment, gross	87,072,000		87,072,000		82,800,000
Less: Accumulated depreciation and amortization	(49,863,000)		(49,863,000)		(45,342,000)
Property and equipment, net	37,209,000		37,209,000		37,458,000
Depreciation and amortization expense	3,900,000	4,100,000	8,000,000	8,300,000
Furniture and fixtures
Property and Equipment, net
Property and equipment, gross	6,515,000		6,515,000		5,921,000
Computer and office equipment
Property and Equipment, net
Property and equipment, gross	9,520,000		9,520,000		9,126,000
Software
Property and Equipment, net
Property and equipment, gross	9,445,000		9,445,000		9,429,000
Leasehold improvements
Property and Equipment, net
Property and equipment, gross	16,842,000		16,842,000		16,065,000
Machinery and equipment
Property and Equipment, net
Property and equipment, gross	31,843,000		31,843,000		33,493,000
CyberKnife shared ownership systems
Property and Equipment, net
Property and equipment, gross	4,979,000		4,979,000		4,979,000
Construction in progress
Property and Equipment, net
Property and equipment, gross	$ 7,928,000		$ 7,928,000		$ 3,787,000