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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Consolidated net income (loss) $ 15,095 $ (1,731)
Adjustments to reconcile consolidated net income (loss) to net cash provided by (used for) operating activities:    
Depreciation and amortization 2,806 2,711
Stock-based compensation expense, net 1,571 710
Provision for doubtful accounts   43
Increase in long-term income taxes payable 5 4
Decrease in long-term deferred revenue (80) (80)
Deferred income taxes 2 (1)
Credit gain on available-for-sale securities (1) (1)
(Increase) decrease in other assets (26) 75
Change in current assets and liabilities, net (1,599) (2,639)
Net cash provided by (used for) operating activities 17,773 (909)
Investing activities:    
Purchases of short-term investments (50,706)  
Sales or maturities of short-term investments 5,000  
Additions to property, plant and equipment (9,264) (2,999)
Net cash used for investing activities (54,970) (2,999)
Financing activities:    
Proceeds from employee stock plans 3,050 2,061
Payment of contingent consideration obligations (46) (89)
Net cash provided by financing activities 3,004 1,972
Effect of foreign exchange rates on cash (138) 19
Net decrease in cash and cash equivalents (34,331) (1,917)
Cash and cash equivalents at beginning of period 161,742 84,668
Cash and cash equivalents at end of period $ 127,411 $ 82,751