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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Cash flows from operating activities:    
Net loss $ (1,433) $ (9,723)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 6,098 6,393
Depreciation and amortization of capital expenditures 1,469 1,347
Amortization of intangible assets 652 516
Non-cash operating lease expense 1,592 899
Other 24 (224)
Changes in operating assets and liabilities:    
Accounts receivable, net 327 43
Inventories and deferred inventory costs (524) (1,389)
Prepaid expenses and other assets (1,818) (2,303)
Accounts payable and other liabilities (7,140) (2,139)
Deferred revenue 418 425
Net cash used in operating activities (335) (6,155)
Cash flows from investing activities:    
Purchases of short-term investments (12,013) (19,196)
Proceeds from maturities and sales of short-term investments 11,986 32,046
Capital expenditures (1,508) (1,632)
Business acquisition, net of cash assumed   (7,073)
Net cash (used in) provided by investing activities (1,535) 4,145
Cash flows from financing activities:    
Proceeds from issuance of common stock 1,901 1,808
Payment of acquisition-related holdback   (420)
Net cash provided by financing activities 1,079 658
Net decrease in cash and cash equivalents (791) (1,352)
Cash and cash equivalents at beginning of period 11,680 15,370
Cash and cash equivalents at end of period 10,889 14,018
Restricted Stock Units (RSUs)    
Cash flows from financing activities:    
Shares repurchased for tax withholdings on vesting of restricted stock units ("RSU") $ (822) $ (730)