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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities:    
Consolidated net income $ 6,862 $ 11,891
Adjustments to reconcile consolidated net income to net cash provided by operating activities:    
Depreciation and amortization 4,998 4,539
Stock-based compensation expense, net 1,539 1,916
(Benefit) provision for doubtful accounts (117) 65
Decrease in long-term income taxes payable (2)  
Increase in other long-term liabilities   5
Decrease in long-term deferred revenue (36) (36)
Gain on disposal of equipment (22) (16)
Deferred income taxes 24 25
Credit gain on available-for-sale securities (2) (4)
Change in current assets and liabilities, net (8,005) (9,857)
Net cash provided by operating activities 5,239 8,528
Investing activities:    
Additions to property, plant and equipment (5,864) (3,558)
Proceeds from sale of equipment 22 16
Decrease in other assets (137) (67)
Net cash used for investing activities (5,979) (3,609)
Financing activities:    
Proceeds from issuance of Common Stock 1,707 4,966
Payment of contingent consideration obligations (102) (172)
Net cash provided by financing activities 1,605 4,794
Effect of foreign exchange rates on cash 60 (23)
Net increase in cash and cash equivalents 925 9,690
Cash and cash equivalents at beginning of period 70,557 44,230
Cash and cash equivalents at end of period $ 71,482 $ 53,920