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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Cash flows from operating activities:    
Net income $ 15,890 $ 5,483
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 4,561 3,947
Amortization 7,263 7,090
Accretion of discount on investments (28) (71)
Reduction in the carrying amount of right-of-use assets 1,511 1,277
Stock-based compensation expense 5,623 5,295
Amortization of debt issuance costs 19 51
Deferred income tax benefit (198) 0
Provision for excess and obsolete inventories 3,287 2,725
Loss on disposal of long-lived assets 204 118
Loss on derivative instruments 676 59
Foreign currency transaction (losses) gains (266) 121
Changes in assets and liabilities:    
Accounts receivable 7,803 13,805
Inventories 928 (8,658)
Prepaid expenses and other current assets 240 (2,167)
Other assets 194 (564)
Accounts payable 763 (7,148)
Accrued liabilities (6,970) (6,275)
Other liabilities 33 32
Deferred revenues (123) 1,931
Operating lease liabilities (1,591) (1,690)
Net cash provided by operating activities 39,339 20,638
Net cash provided by operating activities    
Acquisition of property, plant and equipment (12,050) (6,028)
Proceeds from sale of a subsidiary 40 28
Purchases of marketable securities (16,441) (12,382)
Purchases of marketable securities 23,009 9,050
Net cash used in investing activities (5,442) (9,332)
Net cash used in investing activities    
Cash flows from financing activities: 4,513 3,870
Purchase and retirement of common stock (385) (302)
Proceeds from term loan debt (13,199) (7,500)
Payment of term loan debt issuance costs (9,071) (3,932)
Net cash used in financing activities 312 (207)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 25,138 7,167
Net increase in cash, cash equivalents and restricted cash 147,937 100,546
Cash, cash equivalents and restricted cash, beginning of period 173,075 107,713
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 2,116 (1,253)
Operating lease, right-of-use assets obtained in exchange for lease obligations 6,307 35,713
Supplemental disclosure of cash flow information:    
Cash paid for income taxes, net 2,419 1,082
Cash paid for interest $ 291 $ 302