CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 10,358	$ 2,779
Adjustments to reconcile net income to net cash provided by operating activites:
Depreciation	1,132	716
Amortization	714	74
Stock-based compensation	1,062	595
Deferred income tax provision (benefit)	6,579	(336)
Other	207	37
Changes in assets and liabilities:
Accounts receivable, net	(2,050)	(438)
Inventory	(19)	1,491
Other current and noncurrent assets	(258)	153
Deferred cost of goods sold	(3)	(14)
Accounts payable	(277)	(1,737)
Accrued compensation	(58)	(366)
Accrued warranty	(11)	29
Accrued taxes and fees	205	(127)
Deferred revenue	94	235
Other current and noncurrent liabilities	1,688	151
Net cash provided by operating activities	19,363	3,242
Cash flows from investing activities:
Purchases of property and equipment	(4,730)	(1,211)
Acquisition of businesses, net of cash acquired	0	(713)
Net cash used in investing activities	(4,730)	(1,924)
Cash flows from financing activities:
Capital lease payments	(59)	(247)
Repurchase of common stock	(147)	(1,038)
Proceeds from issuance of common stock under employee stock plans	1,255	693
Net cash provided by (used in) financing activities	1,049	(592)
Net increase in cash and cash equivalents	15,682	726
Cash and cash equivalents at the beginning of the period	22,426	16,474
Cash and cash equivalents at the end of the period	38,108	17,200
Supplemental cash flow information
Issuance of common stock in connection with acquisitions of businesses	0	29,125
Acquisition of property and equipment, net in connection with acquisitions of businesses	0	372
Transfer of net assets in purchase of strategic investment	$ 0	$ 297