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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities    
Net income $ 85,804 $ 35,386
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,724 5,336
Deferred income taxes 3,934 5,107
Stock-based compensation expense 6,228 5,784
Provision for excess and obsolete inventory 2,061 1,888
Changes in operating assets and liabilities:    
Accounts receivable (45,783) 7,091
Inventories (27,511) (32,418)
Prepaid expenses and other current assets (5,304) (3,309)
Accounts payable and other current liabilities 1,507 7,282
Deferred revenue 3,290 12,460
Income taxes (529) (27)
Other assets and liabilities (199) 1,341
Net cash provided by operating activities 29,222 45,921
Cash flows from investing activities    
Expenditures for property, plant and equipment and capitalized software (3,356) (2,392)
Net cash used in investing activities (3,356) (2,392)
Cash flows from financing activities    
Net settlement on restricted stock grants (9,211) (6,495)
Repurchase of common stock (32,498) (24,993)
Principal payments on finance lease obligation (475) (362)
Proceeds from exercise of stock options 789 3,075
Net cash used in financing activities (40,684) (28,267)
Proceeds from Employee Stock Purchase Plan purchases 711 508
Effect of exchange rate changes on cash and cash equivalents 7,058 992
Net (decrease) increase in cash, cash equivalents and restricted cash (7,760) 16,254
Cash, cash equivalents and restricted cash at beginning of period 295,680 204,232
Cash, cash equivalents and restricted cash at end of period $ 287,920 $ 220,486