CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 5,365	$ 4,483
Adjustments to reconcile net income to net cash provided by operating activites:
Depreciation and amortization	1,532	960
Stock-based compensation	1,013	228
Change in fair value of warrant liability	0	(167)
Deferred income tax benefit	(336)	0
Other	130	57
Changes in assets and liabilities:
Accounts receivable, net	(642)	(231)
Inventory	1,596	(458)
Other current and noncurrent assets	405	(75)
Deferred cost of goods sold	(6)	2
Accounts payable	(2,059)	1,272
Accrued compensation	319	239
Accrued warranty	34	86
Accrued taxes and fees	(396)	301
Deferred revenue	(75)	(271)
Other current and noncurrent liabilities	(472)	548
Net cash provided by operating activities	6,408	6,974
Cash flows from investing activities:
Purchases of property and equipment	(1,743)	(1,891)
Purchase of investments	0	(2,000)
Purchase of strategic investment	0	(315)
Acquisition of businesses, net of cash acquired	(713)	(998)
Sale of property and equipment	0	2
Net cash used in investing activities	(2,456)	(5,202)
Cash flows from financing activities:
Capital lease payments	(273)	(28)
Repurchase of common stock	(1,038)	(4,026)
Buyback of employee stock options	0	(101)
Proceeds from exercise of warrants	0	880
Proceeds from issuance of common stock	(60)	278
Proceeds from issuance of common stock under employee stock plans	949	1,755
Net cash used in financing activities	(422)	(1,242)
Net increase (decrease) in cash and cash equivalents	3,530	530
Cash and cash equivalents at the beginning of the period	16,474	18,056
Cash and cash equivalents at the end of the period	20,004	18,586
Supplemental cash flow information
Issuance of common stock in connection with acquisitions of businesses	31,358	600
Fair value of options assumed in connection with acquisitions of businesses	274	0
Acquisition of property and equipment, net in connection with acquisitions of businesses	372	80
Acquisition of capital lease in connection with acquisitions of businesses	297	0
Transfer of net assets in purchase of strategic investment	$ 0	$ 41