Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Adjustments to reconcile net loss to net cash used for operating activities:
Net loss	$ (24,782)	$ (21,526)
Depreciation	4,401	5,283
Amortization of purchased intangible assets	104	358
Stock-based compensation expense	9,446	7,548
Veloce acquisition consideration	7,140	39,739
Gain on sale of TPack	0	(19,699)
Loss on disposals of property and equipment	22	27
Impairment of a strategic investment	2,500	0
Non-cash restructuring charges	0	298
Tax effect on other comprehensive loss	(84)	0
Changes in operating assets and liabilities:
Accounts receivable	7,297	(2,366)
Inventories	1,334	105
Other assets	(753)	159
Accounts payable	(11,904)	(1,943)
Accrued payroll and other accrued liabilities	(2,589)	1,810
Veloce accrued liability	(7,499)	(44,240)
Deferred revenue	(166)	(594)
Net cash used for operating activities	(14,027)	(35,359)
Investing activities:
Proceeds from sales and maturities of short-term investments	1,920	21,303
Purchases of short-term investments	(2,069)	(8,177)
Proceeds from sale of property and equipment	1	20
Purchase of property and equipment	(7,300)	(2,023)
Proceeds from sale of strategic equity investment	0	1,286
Proceeds from sale of TPack, net	(3,353)	(29,498)
Net cash (used for) provided by investing activities	(4,095)	41,907
Financing activities:
Proceeds from issuance of common stock	1,863	6,936
Funding of restricted stock units withheld for taxes	(1,246)	(4,079)
Other	(88)	(562)
Net cash provided by financing activities	529	2,295
Net (decrease) increase in cash and cash equivalents	(17,593)	8,843
Cash and cash equivalents at beginning of year	71,539	19,065
Cash and cash equivalents at end of period	53,946	27,908
Supplementary cash flow disclosures:
Cash paid for income taxes	425	379
Common stock issued for Veloce merger consideration	$ 615	$ 29,041