CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 260	$ (917)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Allowance for sales returns, doubtful accounts and other	1	3
Provision for excess and obsolete inventories	85	388
Depreciation and amortization	424	333
Stock-based compensation	443	474
Amortization of premium on investments	25	93
Changes in assets and liabilities:
Accounts receivable	(1,703)	(1,169)
Inventory	(494)	(650)
Prepaid expenses and other assets	(347)	(908)
Accounts payable	(447)	1,534
Accrued expenses and other liabilities	(999)	(1,845)
Deferred revenue	(354)	207
Net cash used in operating activities	(3,106)	(2,457)
Cash flows from investing activities:
Sales and maturities of short-term investments	3,148	7,000
Purchases of property and equipment	(135)	(6)
Net cash provided by investing activities	3,013	6,994
Cash flows from financing activities:
Repurchase of common stock	(3,906)	(2,453)
Proceeds from issuance of common stock under employee stock plans	273	316
Net cash used in financing activities	(3,633)	(2,137)
Net increase (decrease) in cash and cash equivalents	(3,726)	2,400
Cash and cash equivalents at beginning of the year	31,963	36,776
Cash and cash equivalents at end of the period	28,237	39,176
Supplemental cash flow information:
Net cash paid (received) for income taxes	$ 1,256	$ (132)