CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 886	$ (1,264)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Allowance for sales returns, doubtful accounts and other	3	(3)
Provision for excess and obsolete inventories	333	659
Depreciation and amortization	821	651
Stock-based compensation	930	973
Amortization of premium on investments	33	145
Changes in assets and liabilities:
Accounts receivable	(1,332)	2,109
Inventory	(2,137)	(883)
Prepaid expenses and other assets	(107)	(152)
Accounts payable	685	784
Accrued expenses and other liabilities	1,023	(2,194)
Deferred revenue	(719)	(960)
Net cash provided by (used in) operating activities	419	(135)
Cash flows from investing activities:
Purchase of investments	(9,410)	(9,026)
Sales and maturities of short-term investments	12,100	14,335
Purchases of property and equipment	(168)	(31)
Net cash provided by investing activities	2,522	5,278
Cash flows from financing activities:
Repurchase of common stock	(6,618)	(3,074)
Proceeds from issuance of common stock under employee stock plans	517	576
Net cash used in financing activities	(6,101)	(2,498)
Net increase (decrease) in cash and cash equivalents	(3,160)	2,645
Cash and cash equivalents at beginning of the year	31,963	36,776
Cash and cash equivalents at end of the period	28,803	39,421
Supplemental cash flow information:
Net cash paid (received) for income taxes	$ 1,339	$ (97)