CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (6,076)	$ (125)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for doubtful accounts and other	17	(9)
Provision for excess and obsolete inventories	159	89
Non-cash lease expense	152	172
Depreciation and amortization	354	365
Stock-based compensation	755	651
Amortization of premium (discount) on investments	1	(8)
Changes in assets and liabilities:
Accounts receivable	2,475	(27)
Inventory	(580)	133
Prepaid expenses and other assets	214	(523)
Accounts payable	(115)	(190)
Accrued expenses and other liabilities	(931)	(1,775)
Net cash used in operating activities	(3,575)	(1,247)
Cash flows from investing activities:
Purchase of investments	(5,250)	(1,990)
Maturities of short-term investments	6,000	4,860
Purchases of property and equipment	(50)	(33)
Net cash provided by investing activities	700	2,837
Cash flows from financing activities:
Proceeds from issuance of common stock under employee stock plans	2,339	2,350
Net cash provided by financing activities	2,339	2,350
Net increase (decrease) in cash and cash equivalents	(536)	3,940
Cash and cash equivalents at beginning of the period	51,506	42,495
Cash and cash equivalents at end of the period	50,970	46,435
Non-cash financing activities:
Purchases of property and equipment through accounts payable and accruals	16	30
Supplemental cash flow information:
Net cash paid for income taxes	$ 52	$ 111