CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 1,234	$ (2,083)
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	491	914
Depreciation and amortization	1,189	1,037
Stock-based compensation	1,359	1,387
Amortization of premium on investments	52	177
Changes in assets and liabilities:
Accounts receivable	416	(394)
Inventory	(2,560)	55
Prepaid expenses and other assets	(286)	(364)
Accounts payable	(387)	(726)
Accrued expenses and other liabilities	(60)	(2,278)
Deferred revenue	(119)	(873)
Net cash provided by (used in) operating activities	1,332	(3,151)
Cash flows from investing activities:
Purchase of investments	(14,062)	(12,526)
Sales and maturities of short-term investments	17,600	21,335
Acquisition		(4,359)
Restricted cash		(2,984)
Purchases of property and equipment	(194)	(1,101)
Net cash provided by investing activities	3,344	365
Cash flows from financing activities:
Repurchase of common stock	(7,112)	(4,083)
Proceeds from issuance of common stock under employee stock plans	968	818
Net cash used in financing activities	(6,144)	(3,265)
Net decrease in cash and cash equivalents	(1,468)	(6,051)
Cash and cash equivalents at beginning of the year	31,963	36,776
Cash and cash equivalents at end of the period	30,495	30,725
Supplemental cash flow information:
Net cash paid for income taxes	$ 1,341	$ 78