CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Cash flows from operating activities:
Net loss	$ (1,751)	$ (2,441)	$ (18,801)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation expense	12,682	12,275	12,761
Depreciation and amortization of capital expenditures	3,117	2,877	2,548
Amortization of intangible assets and acquisition-related items	1,304	1,304	1,027
Amortization of operating lease right-of-use assets	2,939	3,198	1,997
Non-cash restructuring charges			1,603
Deferred income taxes			(144)
Other	53	46	(147)
Changes in operating assets and liabilities:
Accounts receivable, net	(2,082)	(637)	135
Inventories and deferred inventory costs	(1,571)	(3,378)	407
Prepaid expenses and other assets	(4,609)	(5,496)	(4,965)
Accounts payable, accrued expenses and other liabilities	(3,599)	(3,911)	(4,089)
Deferred revenue	172	530	104
Net cash provided by (used in) operating activities	6,655	4,367	(7,564)
Cash flows from investing activities:
Proceeds from maturities of short-term investments	16,505	22,866	38,522
Proceeds from sales of short-term investments	300	600	5,924
Purchases of short-term investments	(17,488)	(20,077)	(31,234)
Capital expenditures	(4,204)	(3,160)	(3,273)
Business acquisition, net of cash assumed			(7,073)
Net cash (used in) provided by investing activities	(4,887)	229	2,866
Cash flows from financing activities:
Proceeds from issuance of common stock	2,706	2,905	2,951
Payment of credit facility issuance costs		(242)
Payment of acquisition-related costs			(420)
Net cash provided by financing activities	601	1,022	1,008
Net increase (decrease) in cash and cash equivalents	2,369	5,618	(3,690)
Cash and cash equivalents at beginning of period	17,298	11,680	15,370
Cash and cash equivalents at end of period	19,667	17,298	11,680
Non-cash investing and financing activities:
Capital expenditures included in accounts payable at period-end	324	1	413
Restricted Stock Units (RSUs)
Cash flows from financing activities:
Shares repurchased for tax withholdings on vesting of RSUs	$ (2,105)	$ (1,641)	$ (1,523)