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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Cash flows from operating activities:    
Net loss $ (16,507) $ (11,083)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 9,647 7,734
Depreciation and amortization of capital expenditures 1,976 1,717
Amortization of acquired intangible assets 900 540
Non-cash restructuring charges 1,603  
Non-cash operating lease expense 1,365  
Other (79) (613)
Changes in operating assets and liabilities:    
Accounts receivable, net (289) (207)
Inventories and deferred inventory costs (644) (1,693)
Prepaid expenses and other assets (3,645) (2,822)
Accounts payable and other liabilities (1,438) 4,164
Deferred revenue 329 458
Net cash used in operating activities (6,782) (1,805)
Cash flows from investing activities:    
Purchases of short-term investments (31,236) (26,709)
Proceeds from maturities and sales of short-term investments 42,996 40,762
Capital expenditures (2,384) (1,438)
Business acquisition, net of cash assumed (7,073) (2,402)
Net cash provided by investing activities 2,303 10,213
Cash flows from financing activities:    
Proceeds from issuance of common stock 2,740 2,763
Payment of acquisition-related holdback (420)  
Net cash provided by financing activities 797 465
Net (decrease) increase in cash and cash equivalents (3,682) 8,873
Cash and cash equivalents at beginning of period 15,370 4,483
Cash and cash equivalents at end of period 11,688 13,356
Restricted Stock Units (RSUs)    
Cash flows from financing activities:    
Shares repurchased for tax withholdings on vesting of restricted stock units ("RSU") $ (1,523) $ (2,298)