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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ (10,006) $ 2,564
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation of property and equipment 636 412
Amortization of intangible assets 1,148 292
Amortization/accretion of marketable securities (26) 57
Stock-based compensation 14,195 12,972
Other non-cash items, net 26 39
Changes in operating assets and liabilities:    
Accounts receivable 5,567 15,725
Inventories 415 1,079
Prepaid expenses and other current assets 180 1,093
Deferred tax assets (8) (254)
Other assets (81) 56
Accounts payable (2,366) (2,084)
Accrued liabilities (9,640) (7,055)
Income taxes payable (551) (13)
Deferred revenue 281 (1,870)
Other long-term liabilities 294 11
Net cash provided by operating activities 64 23,024
Cash flows from investing activities:    
Purchase of investments (8,969) (7,070)
Sales of investments 3,500 1,000
Maturities of investments 15,850 3,490
Purchase of property and equipment (671) (955)
Net cash provided by (used in) investing activities 9,710 (3,535)
Cash flows from financing activities:    
Stock repurchase (20,624) (8,773)
Proceeds from exercise of stock options and employee stock purchase plan 1,669 1,595
Payment for intangible asset (799) 0
Net cash used in financing activities (19,754) (7,178)
Net increase (decrease) in cash, cash equivalents and restricted cash (9,980) 12,311
Cash, cash equivalents and restricted cash at beginning of period 346,681 322,880
Cash, cash equivalents and restricted cash at end of period 336,701 335,191
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 908 290
Supplemental disclosure of noncash investing and financing activities:    
Unpaid liabilities related to intangible and fixed assets additions $ 342 $ 9,937