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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Cash flows from operating activities:    
Net income $ 40,794 $ 1,810
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,881 9,383
Stock-based compensation 13,862 15,508
Gain/loss on investments, net 8 4,530
Change in fair value of contingent consideration (3,003) 89
Deferred income taxes 7,083 2,867
Provision for excess and obsolete inventory 2,255 4,579
Changes in assets and liabilities:    
Accounts receivable 46,455 (323)
Inventories (81,907) 80,325
Prepaid expenses and other assets (4,367) 1,031
Accounts payable (20,477) (4,791)
Accrued employee compensation (2,291) 2,769
Other accrued liabilities 4,760 (27,052)
Deferred revenue 1,859 2,281
Income taxes payable (4,402) (836)
Net cash provided by operating activities 8,510 92,170
Cash flows from investing activities:    
Purchases of property and equipment (4,556) (3,631)
Purchases of long-term investments (340) (6,265)
Other 13 2
Net cash used in investing activities (4,883) (9,894)
Cash flows from financing activities:    
Repurchases of common stock (24,999) (22,508)
Restricted stock unit withholdings (5,915) (3,607)
Proceeds from exercise of stock options 6,863 3,786
Proceeds from issuance of common stock under employee stock purchase plan 2,905 2,478
Net cash used in financing activities (21,146) (19,851)
Net increase (decrease) in cash and cash equivalents (17,519) 62,425
Cash and cash equivalents, at beginning of period 346,460 190,208
Cash and cash equivalents, at end of period $ 328,941 $ 252,633