Quarterly Financial Information (unaudited) - Operating Results (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended															12 Months Ended			0 Months Ended	33 Months Ended
	Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Apr. 22, 2013	Mar. 31, 2015
Schedule of Quarterly Information [Line Items]
Net revenues	$ 37,047,000	[1]	$ 36,747,000	$ 40,945,000	[2]	$ 50,272,000	[3]	$ 51,771,000	[4]	$ 54,844,000	[5]	$ 55,387,000	[6]	$ 54,148,000	[7]	$ 165,011,000	$ 216,150,000	$ 195,642,000
Cost of revenues	16,482,000	[1]	14,842,000	17,716,000	[2]	20,257,000	[3]	19,806,000	[4]	21,644,000	[5]	21,397,000	[6]	22,342,000	[7]	69,297,000	85,189,000	83,048,000
Gross profit	20,565,000	[1]	21,905,000	23,229,000	[2]	30,015,000	[3]	31,965,000	[4]	33,200,000	[5]	33,990,000	[6]	31,806,000	[7]	95,714,000	130,961,000	112,594,000
Total operating expenses	36,641,000	[1]	33,649,000	32,562,000	[2]	43,536,000	[3]	9,229,000	[4]	40,900,000	[5]	66,757,000	[6]	24,556,000	[7]	146,388,000	141,442,000	247,464,000
Operating loss	(16,076,000)	[1]	(11,744,000)	(9,333,000)	[2]	(13,521,000)	[3]	22,736,000	[4]	(7,700,000)	[5]	(32,767,000)	[6]	7,250,000	[7]	(50,674,000)	(10,481,000)	(134,870,000)
Interest and other income (expense)	1,030,000	[1]	475,000	(2,112,000)	[2]	315,000	[3]	418,000	[4]	617,000	[5]	576,000	[6]	3,795,000	[7]	2,764,000	5,052,000	2,595,000
Loss before income taxes	(15,046,000)	[1]	(11,269,000)	(11,445,000)	[2]	(13,206,000)	[3]	23,154,000	[4]	(7,083,000)	[5]	(32,191,000)	[6]	11,045,000	[7]	(50,966,000)	(5,075,000)	(134,669,000)
Income tax (benefit) expense	99,000	[1]	862,000	272,000	[2]	(141,000)	[3]	38,000	[4]	201,000	[5]	192,000	[6]	188,000	[7]	1,092,000	619,000	(554,000)
Net loss	(15,145,000)	[1]	(12,131,000)	(11,717,000)	[2]	(13,065,000)	[3]	23,116,000	[4]	(7,284,000)	[5]	(32,383,000)	[6]	10,857,000	[7]	(52,058,000)	(5,694,000)	(134,115,000)
Basic net income (loss) per share (in shares)	$ (0.19)	[1]	$ (0.15)	$ (0.15)	[2]	$ (0.17)	[3]	$ 0.31	[4]	$ (0.10)	[5]	$ (0.45)	[6]	$ 0.16	[7]
Shares used in calculating basic net income (loss) per share (shares)	80,667	[1]	78,920	78,487	[2]	77,916	[3]	75,629	[4]	73,989	[5]	72,610	[6]	69,360	[7]	78,814	72,897	65,258
Diluted net income (loss) per share (in shares)	$ (0.19)	[1]	$ (0.15)	$ (0.15)	[2]	$ (0.17)	[3]	$ 0.30	[4]	$ (0.10)	[5]	$ (0.45)	[6]	$ 0.15	[7]
Shares used in calculating diluted income (loss) per share (shares)	80,667	[1]	78,920	78,487	[2]	77,916	[3]	77,193	[4]	73,989	[5]	72,610	[6]	70,234	[7]	78,814	72,897	65,258
Restructuring charges	(4,100,000)					(1,200,000)						(1,000,000)				(5,421,000)	(1,134,000)	(6,435,000)
Other-than-temporary impairment charges	500,000			2,500,000												0	0	1,143,000
Gain on sale of TPack																0	19,699,000	0
Gain on sale of building								25,800,000								0	25,815,000	0
TPack
Schedule of Quarterly Information [Line Items]
Gain on sale of TPack														19,700,000					19,699,000
Veloce Technologies Inc.
Schedule of Quarterly Information [Line Items]
Research and development expenses incurred	$ 2,100,000					$ 7,100,000				$ 2,900,000		$ 30,400,000		$ 9,300,000		$ 9,200,000	$ 42,700,000			$ 178,500,000

[1] The consolidated operating results for the fourth quarter of fiscal 2015 included a charge of $2.1 million related to the Veloce consideration, a charge of $4.1 million related to restructuring and an impairment charge of $0.5 million related to a strategic investment.

[2] The consolidated operating results for the second quarter of fiscal 2015 included an impairment charge of $2.5 million related to a strategic investment.

[3] The consolidated operating results for the first quarter of fiscal 2015 included a charge of $7.1 million related to the Veloce consideration and a charge of $1.2 million related to restructuring.

[4] The consolidated operating results for the fourth quarter of fiscal 2014 included a gain on sale of building of $25.8 million.

[5] The consolidated operating results for the third quarter of fiscal 2014 included a charge of $2.9 million related to the Veloce consideration.

[6] The consolidated operating results for the second quarter of fiscal 2014 included a charge of $30.4 million related to the Veloce consideration and a charge of $1.0 million related to restructuring.

[7] The consolidated operating results for the first quarter of fiscal 2014 included a charge of $9.3 million related to the Veloce consideration and a gain on sale of TPack of $19.7 million.