CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net loss	$ (2,083)	$ (2,248)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Allowance for sales returns, doubtful accounts and other	(3)	(11)
Provision for excess and obsolete inventories	914	912
Depreciation and amortization	1,037	1,294
Stock-based compensation	1,387	1,533
Amortization of premium on investments	177	478
Changes in assets and liabilities, net of impact of acquisition:
Accounts receivable	(394)	2,727
Inventory	55	(1,786)
Prepaid expenses and other assets	(364)	1,782
Accounts payable	(726)	(1,950)
Accrued expenses and other liabilities	(2,278)	(524)
Deferred revenue	(873)	(262)
Net cash provided by (used in) operating activities	(3,151)	1,945
Cash flows from investing activities:
Purchase of investments	(12,526)	(10,712)
Sales and maturities of short-term investments	21,335	34,754
Acquisition	(7,343)
Purchases of property and equipment	(1,101)	(453)
Net cash provided by investing activities	365	23,589
Cash flows from financing activities:
Repurchase of common stock	(4,083)	(27,120)
Proceeds from issuance of common stock under employee stock plans	818	919
Net cash used in financing activities	(3,265)	(26,201)
Net decrease in cash and cash equivalents	(6,051)	(667)
Cash and cash equivalents at beginning of the year	36,776	41,520
Cash and cash equivalents at end of the period	30,725	40,853
Supplemental cash flow information:
Net cash paid (received) for income taxes	$ 78	$ (1,597)