CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 1,926us-gaap_NetIncomeLoss	$ 2,514us-gaap_NetIncomeLoss	$ 13,939us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activites:
Depreciation	3,540us-gaap_Depreciation	2,567us-gaap_Depreciation	2,523us-gaap_Depreciation
Amortization of intangibles	2,232us-gaap_AmortizationOfIntangibleAssets	1,643us-gaap_AmortizationOfIntangibleAssets	1,428us-gaap_AmortizationOfIntangibleAssets
Amortization of capitalized software	341	147	0
Net accretion of discount and amortization of premium on marketable securities	896us-gaap_AccretionExpense	114us-gaap_AccretionExpense	0us-gaap_AccretionExpense
Gain on disposal of discontinued operations	0	(596)	0
Gain on escrow settlement	0us-gaap_GainLossOnContractTermination	(565)us-gaap_GainLossOnContractTermination	0us-gaap_GainLossOnContractTermination
Stock-based compensation	9,347us-gaap_ShareBasedCompensation	7,595us-gaap_ShareBasedCompensation	2,634us-gaap_ShareBasedCompensation
Tax benefit from stock-based compensation	(151)	(142)	(49)
Deferred income tax provision	2,390us-gaap_DeferredIncomeTaxExpenseBenefit	2,266us-gaap_DeferredIncomeTaxExpenseBenefit	9,308us-gaap_DeferredIncomeTaxExpenseBenefit
Other	256us-gaap_OtherNoncashExpense	650us-gaap_OtherNoncashExpense	616us-gaap_OtherNoncashExpense
Changes in assets and liabilities:
Accounts receivable, net	(1,529)	(1,575)	(2,171)
Inventory	52us-gaap_IncreaseDecreaseInInventories	(276)us-gaap_IncreaseDecreaseInInventories	27us-gaap_IncreaseDecreaseInInventories
Other current and non-current assets	(196)	(488)	(30)
Deferred cost of goods sold	(207)	163	(60)
Accounts payable	605	(1,035)	410
Accrued compensation	1,632	488	524
Accrued warranty	(321)	208	65
Accrued taxes	490	276	440
Deferred revenue	(1,065)	681	345
Other current and non-current liabilities	1,002	282	1,839
Net cash provided by operating activities	21,240	14,917	31,788
Cash flows from investing activities:
Acquisitions of property and equipment	(5,826)	(2,853)	(5,678)
Cost of capitalized software	(724)us-gaap_PaymentsForSoftware	(755)us-gaap_PaymentsForSoftware	(190)us-gaap_PaymentsForSoftware
Purchase of investments	(106,021)	(141,604)	0
Sales of investments	36,764	24,219	0
Proceeds from maturities of investments	63,546	0	0
Acquisition of business, net of cash acquired	0	(18,474)	0
Proceeds from disposition of discontinued operations, net of transaction costs	0	3,000	0
Net cash used in investing activities	(12,261)	(136,467)	(5,868)
Cash flows from financing activities:
Capital lease payments	(149)	(85)	(86)
Repurchase of common stock	(19,371)	(489)	(419)
Tax benefit from stock-based compensation	151	142	49
Proceeds from (cost of) issuance of common stock, net of issuance costs	0	125,750	(43)
Proceeds from issuance of common stock under employee stock plans	4,455us-gaap_ProceedsFromStockPlans	5,167us-gaap_ProceedsFromStockPlans	2,458us-gaap_ProceedsFromStockPlans
Net cash (used in) provided by financing activities	(14,914)	130,485	1,959
Effect of exchange rate changes on cash	(114)	(81)	0
Net (decrease) increase in cash and cash equivalents	(6,049)	8,854	27,879
Cash and cash equivalents at the beginning of the year	59,159	50,305	22,426
Cash and cash equivalents at the end of the year	53,110	59,159	50,305
Supplemental and non-cash disclosures:
Acquisition of property and equipment, net in connection with acquisitions of businesses	0	956	0
Acquisition of capital lease in connection with acquisitions of businesses	0	216	0
Interest paid	5us-gaap_InterestPaid	5us-gaap_InterestPaid	8us-gaap_InterestPaid
Income taxes paid	$ 159us-gaap_IncomeTaxesPaid	$ 427us-gaap_IncomeTaxesPaid	$ 415us-gaap_IncomeTaxesPaid

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