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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Cash flows from operating activities:    
Net income $ 36,359 $ 12,431
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 9,240 8,289
Amortization 13,717 14,169
Reduction in the carrying amount of right-of-use assets 2,419 2,620
Stock-based compensation expense 11,265 10,584
Provision for excess and obsolete inventories 6,407 5,304
Gain on contingent consideration (3,700) 0
Other adjustments to reconcile net income to net cash provided by operating activities 1,327 (173)
Changes in assets and liabilities:    
Accounts receivable 11,364 24,177
Inventories (11,089) (11,574)
Prepaid expenses and other current assets 3,271 (1,838)
Other assets 248 (572)
Accounts payable 5,247 (11,115)
Accrued liabilities 1,529 (309)
Other liabilities 292 (93)
Deferred revenues 3,855 2,216
Operating lease liabilities (2,762) (2,416)
Net cash provided by operating activities 82,447 55,376
Cash flows from investing activities:    
Acquisition of property, plant and equipment (36,743) (11,460)
Proceeds from sale of a subsidiary 82 56
Purchases of marketable securities 35,410 19,710
Net cash used in investing activities (20,977) (12,470)
Net cash used in investing activities    
Payments to Acquire Marketable Securities 19,726 20,776
Cash flows from financing activities:    
Proceeds from issuances of common stock 4,935 3,870
Tax withholdings related to net share settlements of equity awards (3,800) (2,157)
Proceeds from term loan debt 18,000 0
Principal repayments on term loans (26,322) (18,750)
Payment of term loan debt issuance costs (78) 0
Net cash used in financing activities (7,265) (17,037)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 583 279
Effect of exchange rate changes on cash, cash equivalents and restricted cash 54,788 26,148
Net increase in cash, cash equivalents and restricted cash 147,937 100,546
Cash, cash equivalents and restricted cash, beginning of period 202,725 126,694
Fair value of stock options and restricted stock-based awards assumed in connection with acquisition of Cascade Microtech    
Change in accounts payable and accrued liabilities related to property, plant and equipment purchases 2,274 (2,497)
Operating lease, right-of-use assets obtained in exchange for lease obligations 428 35,885
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net 4,133 1,700
Cash paid for interest $ 473 $ 778