Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net loss	$ (32,571)	$ (52,058)	$ (5,694)
Adjustments to reconcile net loss to net cash provided by (used for) operating activities:
Depreciation	7,590	8,555	10,273
Amortization of purchased intangible assets	0	104	482
Amortization of bond premium	687	0	0
Stock-based compensation expense	25,804	18,305	17,021
Veloce acquisition consideration	0	9,230	42,684
Gain on sale of TPack	0	0	(19,699)
Gain on sale of building	0	0	(25,815)
Gain on short-term Investments and other, net	(1,581)	(1,317)	(3,383)
Impairment of strategic investments	0	3,000	0
Tax effect on other comprehensive loss	49	126	(40)
Non-cash restructuring charges	0	2,615	298
Changes in operating assets and liabilities:
Accounts receivable	3,142	12,771	(837)
Inventories	7,382	(4,573)	(6,049)
Other assets	6,754	(1,440)	3,232
Accounts payable	(5,614)	(9,911)	5,778
Accrued payroll and other liabilities	(680)	(3,127)	(671)
Veloce accrued liability	(108)	(9,150)	(63,657)
Deferred revenue	(69)	(152)	(770)
Net cash provided by (used for) operating activities	10,785	(27,022)	(46,847)
Investing activities:
Proceeds from sales and maturities of short-term investments	63,714	16,340	47,810
Purchases of short-term investments	(84,464)	(19,887)	(18,081)
Proceeds from sale of property and equipment	31	1	70
Purchase of property and equipment and other assets	(2,601)	(9,772)	(5,952)
Proceeds from sale of a strategic investment	0	0	1,286
Proceeds from the sale of TPack	0	3,353	29,498
Proceeds from sale of building	0	0	40,176
Net cash provided by (used for) investing activities	(23,320)	(9,965)	94,807
Financing activities:
Proceeds from issuance of common stock	2,979	3,854	11,619
Funding of restricted stock units withheld for taxes	(1,874)	(1,911)	(6,550)
Other	0	0	(555)
Net cash provided by financing activities	1,105	1,943	4,514
Net increase (decrease) in cash and cash equivalents	(11,430)	(35,044)	52,474
Cash and cash equivalents at beginning of year	36,495	71,539	19,065
Cash and cash equivalents at end of year	25,065	36,495	71,539
Supplementary cash flow disclosures:
Cash paid for income taxes	607	732	870
Common stock issued for Veloce merger consideration	$ 2,869	$ 5,625	$ 57,348