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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating activities:    
Consolidated net income $ 6,727 $ 12,794
Adjustments to reconcile consolidated net income to net cash provided by operating activities:    
Depreciation and amortization 8,175 7,647
Stock-based compensation expense, net 4,286 2,292
Provision (benefit) for doubtful accounts 23 (138)
Increase (decrease) in long-term income taxes payable 8 (1)
(Decrease) increase in long-term deferred revenue (241) 902
Gain on disposal of equipment (9) (23)
Deferred income taxes 16 24
Credit gain on available-for-sale securities (3) (3)
Change in current assets and liabilities, net (3,742) (6,955)
Net cash provided by operating activities 15,240 16,539
Investing activities:    
Additions to property, plant and equipment (16,837) (9,122)
Proceeds from sale of equipment 9 23
Decrease (increase) in other assets 135 (37)
Net cash used for investing activities (16,693) (9,136)
Financing activities:    
Proceeds from employee stock plans 10,836 3,423
Proceeds from public offering of Common Stock 109,681  
Payment of contingent consideration obligations (186) (198)
Net cash provided by financing activities 120,331 3,225
Effect of foreign exchange rates on cash 59 44
Net increase in cash and cash equivalents 118,937 10,672
Cash and cash equivalents at beginning of year 84,668 70,557
Cash and cash equivalents at end of year $ 203,605 $ 81,229