Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net revenues	$ 37,813	$ 50,272
Cost of revenues	16,806	20,257
Gross profit	21,007	30,015
Operating expenses:
Research and development	21,617	33,205
Selling, general and administrative	8,764	9,058
Amortization of purchased intangible assets	0	62
Restructuring	96	1,211
Total operating expenses	30,477	43,536
Operating loss	(9,470)	(13,521)
Realized gain on short-term investments and interest income, net	1,619	336
Other income (expense), net	25	(21)
Loss before income taxes	(7,826)	(13,206)
Income tax benefit	(422)	(141)
Net loss	$ (7,404)	$ (13,065)	[1]
Basic and diluted net loss per share (in dollars per share)	$ (0.09)	$ (0.17)
Shares used in calculating basic and diluted net loss per share (in Shares)	81,179	77,916

[1] The Statement of Cash Flows for the three months ended June 30, 2014 reflects an immaterial revision to correct outstanding payables related to purchases of property and equipment previously included in net cash used for investing activities to net cash used for operating activities. As a result, net cash used for operating activities increased by $0.3 million and net cash used for investing activities decreased by the corresponding amount.