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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2018
Jul. 02, 2017
Cash flows from operating activities:    
Net income $ 360 $ 30,576
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,655 14,224
Purchase premium amortization/discount accretion on investments, net (311) 100
Stock-based compensation 17,120 10,829
Impairment charges on investment 1,400 0
Deferred income taxes 1,133 1,788
Changes in assets and liabilities:    
Accounts receivable 75,028 9,252
Inventories (47,933) (15,911)
Prepaid expenses and other assets (20,860) 5,519
Accounts payable (4,400) (39,283)
Accrued employee compensation 11,074 (9,079)
Other accrued liabilities (3,224) (1,870)
Deferred revenue 4,025 1,780
Income taxes payable (5,000) (4,544)
Net cash provided by operating activities 40,067 3,381
Cash flows from investing activities:    
Purchases of short-term investments (70,017) (56,876)
Proceeds from maturities of short-term investments 69,412 67,648
Purchases of property and equipment (13,368) (6,162)
Purchases of investments 0 (1,400)
Payments made in connection with business acquisition, net of cash acquired 0 (737)
Net cash provided by (used in) investing activities (13,973) 2,473
Cash flows from financing activities:    
Repurchases of common stock 0 (56,631)
Restricted stock unit withholdings (7,168) (5,649)
Proceeds from exercise of stock options 2,869 3,972
Proceeds from issuance of common stock under employee stock purchase plan 2,732 2,662
Net cash used in financing activities (1,567) (55,646)
Net increase (decrease) in cash and cash equivalents 24,527 (49,792)
Cash and cash equivalents, at beginning of period 202,870 240,468
Cash and cash equivalents, at end of period $ 227,397 $ 190,676