Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net revenues	$ 55,387	$ 46,324	$ 109,535	$ 87,618
Cost of revenues	21,397	20,561	43,739	38,916
Gross profit	33,990	25,763	65,796	48,702
Operating expenses:
Research and development	56,550	34,383	91,056	69,154
Selling, general and administrative	9,146	13,531	18,672	26,001
Gain on sale of TPack	0	0	(19,699)	0
Amortization of purchased intangible assets	62	601	192	1,251
Restructuring charges, net	999	0	1,092	0
Total operating expenses	66,757	48,515	91,313	96,406
Operating loss	(32,767)	(22,752)	(25,517)	(47,704)
Interest income (expense), net	488	745	4,154	2,424
Other income (expense), net	88	90	217	173
Loss before income taxes	(32,191)	(21,917)	(21,146)	(45,107)
Income tax expense (benefit)	192	(360)	380	(160)
Net loss	$ (32,383)	$ (21,557)	$ (21,526)	$ (44,947)
Basic and diluted net loss per share (in dollars per share)	$ (0.45)	$ (0.33)	$ (0.30)	$ (0.71)
Weighted Average Number of Shares Outstanding, Basic and Diluted	72,610	64,947	70,985	63,678