CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net income	$ 8,617	$ 1,947
Adjustments to reconcile net income to net cash provided by operating activites:
Depreciation	505	338
Amortization	357	26
Stock-based compensation	556	266
Deferred income tax provision (benefit)	5,778	(336)
Other	75	60
Changes in assets and liabilities:
Accounts receivable, net	(626)	(255)
Inventory	(19)	527
Other current and noncurrent assets	(148)	60
Deferred cost of goods sold	(14)	5
Accounts payable	(35)	(1,085)
Accrued compensation	(22)	207
Accrued warranty	18	16
Accrued taxes and fees	112	123
Deferred revenue	(183)	(144)
Other current and noncurrent liabilities	(45)	385
Net cash provided by operating activities	14,926	2,140
Cash flows from investing activities:
Purchases of property and equipment	(1,048)	(185)
Acquisition of businesses, net of cash acquired	0	(715)
Net cash used in investing activities	(1,048)	(900)
Cash flows from financing activities:
Capital lease payments	(43)	(9)
Repurchase of common stock	(74)	(1,038)
Proceeds from issuance of common stock under employee stock plans	87	267
Net cash used in financing activities	(30)	(780)
Net increase (decrease) in cash and cash equivalents	13,848	460
Cash and cash equivalents at the beginning of the period	22,426	16,474
Cash and cash equivalents at the end of the period	36,274	16,934
Supplemental cash flow information
Issuance of common stock in connection with acquisitions of businesses	0	750
Acquisition of property and equipment, net in connection with acquisitions of businesses	$ 0	$ 17