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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities:    
Consolidated net income $ 12,794 $ 24,939
Adjustments to reconcile consolidated net income to net cash provided by operating activities:    
Depreciation and amortization 7,647 6,870
Stock-based compensation expense, net 2,292 2,604
(Benefit) provision for doubtful accounts (138) 91
Decrease in long-term income taxes payable (1)  
Increase in other long-term liabilities   7
Increase (decrease) in long-term deferred revenue 902 (54)
Gain on disposal of equipment (23) (45)
Deferred income taxes 24 26
Credit gain on available-for-sale securities (3) (6)
Change in current assets and liabilities, net (6,955) (11,590)
Net cash provided by operating activities 16,539 22,842
Investing activities:    
Additions to property, plant and equipment (9,122) (6,894)
Proceeds from sale of equipment 23 45
Decrease in other assets (37) (92)
Net cash used for investing activities (9,136) (6,941)
Financing activities:    
Proceeds from issuance of Common Stock 3,423 8,378
Payment of contingent consideration obligations (198) (208)
Net cash provided by financing activities 3,225 8,170
Effect of foreign exchange rates on cash 44 (95)
Net increase in cash and cash equivalents 10,672 23,976
Cash and cash equivalents at beginning of period 70,557 44,230
Cash and cash equivalents at end of period $ 81,229 $ 68,206