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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Operating activities:    
Consolidated net income $ 20,676,000 $ 2,561,000
Adjustments to reconcile consolidated net income to net cash (used for) provided by operating activities:    
Depreciation and amortization 5,337,000 5,189,000
Stock-based compensation expense 3,852,000 4,349,000
Provision for doubtful accounts 0 7,000
Litigation payment (28,557,000) 0
Decrease in other assets 101,000 480,000
Deferred income taxes (337,000) (2,000)
Increase in long-term income taxes payable 23,000 74,000
Change in current assets and liabilities, net (5,037,000) 7,470,000
Net cash (used for) provided by operating activities (3,942,000) 20,128,000
Investing activities:    
Additions to property, plant and equipment and internal-use software (12,387,000) (4,550,000)
Net cash used for investing activities (12,387,000) (4,550,000)
Financing activities:    
Proceeds from employee stock plans 17,812,000 3,166,000
Net cash provided by financing activities 17,812,000 3,166,000
Effect of foreign exchange rates on cash (43,000) 82,000
Net increase in cash and cash equivalents 1,440,000 18,826,000
Cash and cash equivalents at beginning of period 402,805,000 277,273,000
Cash and cash equivalents at end of period 404,245,000 296,099,000
Supplemental disclosure:    
Purchases of property, plant and equipment and internal-use software incurred but not yet paid $ 742,000 $ 2,990,000