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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities:    
Consolidated net income $ 47,730 $ 6,727
Adjustments to reconcile consolidated net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 8,564 8,175
Stock-based compensation expense 5,005 4,286
Decrease in long-term deferred revenue (240) (241)
Decrease in contingent consideration obligations (74)  
Gain on disposal of equipment   (9)
Decrease in other assets 56 135
(Decrease) increase in long-term income taxes payable (79) 8
Deferred income taxes 5 16
Credit gain on available-for-sale securities (3) (3)
Provision for doubtful accounts   23
Change in current assets and liabilities, net (20,737) (3,742)
Net cash provided by operating activities 40,227 15,375
Investing activities:    
Purchases of short-term investments (50,706)  
Sales or maturities of short-term investments 50,000  
Additions to property, plant and equipment (30,942) (16,837)
Proceeds from sale of equipment   9
Net cash used for investing activities (31,648) (16,828)
Financing activities:    
Proceeds from employee stock plans 8,621 10,836
Payment of contingent consideration obligations (153) (186)
Proceeds from public offering of Common Stock   109,681
Net cash provided by financing activities 8,468 120,331
Effect of foreign exchange rates on cash (126) 59
Net increase in cash and cash equivalents 16,921 118,937
Cash and cash equivalents at beginning of period 161,742 84,668
Cash and cash equivalents at end of period $ 178,663 $ 203,605