Consolidated Statement of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Total Stockholders' Equity	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Non-controlling Interest
Balance at Jun. 30, 2010	$ 170,076	$ 170,076	$ 59	$ 287,764	$ (71)	$ (117,676)
Balance (in shares) at Jun. 30, 2010			58,526,956
Increase (Decrease) in Stockholders' Equity
Deconsolidation of Morphormics	(27)	(27)				(27)
Exercise of stock options, net	3,601	3,601	1	3,600
Exercise of stock options, net (in shares)			1,396,685
Issuance of common stock under employee stock purchase plan	2,000	2,000		2,000
Issuance of common stock under employee stock purchase plan (in shares)			392,084
Issuance of restricted stock (in shares)			201,992
Share-based compensation	9,842	9,842		9,842
Shares issued in connection with acquisition of TomoTherapy	67,342	67,342	10	67,332
Shares issued in connection with acquisition of TomoTherapy (in shares)			9,112,511
Shares issued in connection with the assumption of restricted stock awards related to acquisition of TomoTherapy			429,591
Restricted stock awards assumed in connection with acquisition of TomoTherapy	1,191	1,191		1,191
Stock options assumed in connection with acquisition of TomoTherapy	2,234	2,234		2,234
Non-controlling interest in CPAC resulting from acquisition of TomoTherapy	10,981						10,981
Net loss	(27,111)	(26,682)				(26,682)	(429)
Cumulative translation adjustment	236	236			236
Unrealized loss on investments, net of tax	(38)	(38)			(38)
Balance at Jun. 30, 2011	240,327	229,775	70	373,963	127	(144,385)	10,552
Balance (in shares) at Jun. 30, 2011			70,059,819
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, net	1,866	1,866	1	1,865
Exercise of stock options, net (in shares)			746,441
Issuance of common stock under employee stock purchase plan	2,581	2,581	1	2,580
Issuance of common stock under employee stock purchase plan (in shares)			755,532
Issuance of restricted stock (in shares)			302,476
Share-based compensation	7,546	7,546		7,546
Embedded conversion feature on Convertible Note	23,189	23,189		23,189
Non-controlling interest in CPAC resulting from acquisition of TomoTherapy	4,101						4,101
Net loss	(78,453)	(72,042)				(72,042)	(6,411)
Cumulative translation adjustment	2,710	2,710			2,710
Balance at Jun. 30, 2012	203,867	195,625	72	409,143	2,837	(216,427)	8,242
Balance (in shares) at Jun. 30, 2012	71,864,268		71,864,268
Increase (Decrease) in Stockholders' Equity
Exercise of stock options, net	4,201	4,201	2	4,199
Exercise of stock options, net (in shares)			1,514,591
Issuance of common stock under employee stock purchase plan	3,257	3,257	1	3,256
Issuance of common stock under employee stock purchase plan (in shares)			663,986
Issuance of restricted stock	1	1	1
Issuance of restricted stock (in shares)			544,386
Share-based compensation	8,236	8,236		8,236
Deconsolidation of CPAC	4,737	(310)		(310)			5,047
Net loss	(116,508)	(103,219)				(103,219)	(13,289)
Cumulative translation adjustment	(498)	(498)			(498)
Unrealized loss on investments, net of tax	(457)	(457)			(457)
Balance at Jun. 30, 2013	$ 106,835	$ 106,835	$ 75	$ 424,524	$ 1,882	$ (319,646)
Balance (in shares) at Jun. 30, 2013	74,587,231		74,587,231