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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities:
Net loss	$ (4,740)	$ (3,685)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Stock-based compensation expense	2,982	2,314
Depreciation and amortization of capital expenditures	652	504
Amortization of acquired intangible assets	207	145
Non-cash operating lease expense	446
Amortization and accretion of premiums from investments	(126)	(57)
Changes in operating assets and liabilities:
Accounts receivable, net	62	(874)
Inventories and deferred inventory costs	(651)	(311)
Prepaid expenses and other assets	(1,005)	(564)
Accounts payable and other liabilities	(3,141)	2,770
Deferred revenue	(430)	52
Net cash (used in) provided by operating activities	(5,744)	294
Cash flows from investing activities:
Purchases of short-term investments	(15,345)	(5,409)
Proceeds from maturities and sales of short-term investments	16,969	11,526
Capital expenditures	(602)	(405)
Business acquisition, net of cash assumed		(2,402)
Net cash provided by investing activities	1,022	3,310
Cash flows from financing activities:
Proceeds from issuance of common stock	1,454	1,166
Net cash provided by financing activities	724	407
Net (decrease) increase in cash and cash equivalents	(3,998)	4,011
Cash and cash equivalents at beginning of period	15,370	4,483
Cash and cash equivalents at end of period	11,372	8,494
Restricted Stock Units (RSUs)
Cash flows from financing activities:
Shares repurchased for tax withholdings on vesting of restricted stock units ("RSU")	$ (730)	$ (759)

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