CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income (loss)	$ (1,512)	$ 260
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Allowance for sales returns, doubtful accounts and other	(1)	1
Provision for excess and obsolete inventories	448	85
Depreciation and amortization	306	424
Stock-based compensation	478	443
Amortization of premium on investments	23	25
Changes in assets and liabilities:
Accounts receivable	188	(1,703)
Inventory	12	(494)
Prepaid expenses and other assets	(394)	(347)
Accounts payable	350	(447)
Accrued expenses and other liabilities	(1,468)	(999)
Deferred revenue	247	(354)
Net cash used in operating activities	(1,323)	(3,106)
Cash flows from investing activities:
Purchase of investments	(3,498)
Maturities of short-term investments	1,250	3,148
Restricted cash	479
Purchases of property and equipment	(105)	(135)
Net cash provided by (used in) investing activities	(1,874)	3,013
Cash flows from financing activities:
Repurchase of common stock		(3,906)
Payment of escrow amount	(479)
Proceeds from issuance of common stock under employee stock plans	1,811	273
Net cash provided by (used in) financing activities	1,332	(3,633)
Net decrease in cash and cash equivalents	(1,865)	(3,726)
Cash and cash equivalents at beginning of the period	33,736	31,963
Cash and cash equivalents at end of the period	31,871	28,237
Non-cash financing activities:
Purchases of property and equipment through accounts payable and accruals	$ 49
Supplemental cash flow information:
Net cash paid for income taxes		$ 1,256