CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (1,893)	$ (1,997)
Adjustments to reconcile net loss to net cash used in operating activities:
Allowance for doubtful accounts and other	(7)	44
Provision for excess and obsolete inventories	136	794
Non-cash lease expense	315
Depreciation and amortization	727	698
Stock-based compensation	1,293	1,094
Amortization of premium on investments	(14)	(11)
Changes in assets and liabilities:
Accounts receivable	(142)	(2,604)
Inventory	504	(459)
Prepaid expenses and other assets	(753)	(367)
Accounts payable	60	613
Accrued expenses and other liabilities	(1,352)	1,575
Net cash used in operating activities	(1,126)	(620)
Cash flows from investing activities:
Purchase of investments	(8,810)	(9,598)
Maturities of short-term investments	10,110	8,050
Purchases of property and equipment	(94)	(1,656)
Net cash provided by (used in) investing activities	1,206	(3,204)
Cash flows from financing activities:
Payment of contingent consideration		(720)
Proceeds from issuance of common stock under employee stock plans	3,149	2,193
Net cash provided by financing activities	3,149	1,473
Net increase (decrease) in cash and cash equivalents	3,229	(2,351)
Cash and cash equivalents at beginning of the period	42,495	40,241
Cash and cash equivalents at end of the period	45,724	37,890
Non-cash financing activities:
Purchases of property and equipment through accounts payable and accruals	25	137
Supplemental cash flow information:
Net cash paid (received) for income taxes	$ 218	$ (7)