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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities:    
Consolidated net income $ 4,306 $ 3,982
Adjustments to reconcile consolidated net income to net cash used for operating activities:    
Depreciation and amortization 2,445 2,269
Stock-based compensation expense, net 773 736
(Benefit) provision for doubtful accounts (88) 32
Increase in long-term income taxes payable 2 5
Increase in other long-term liabilities   2
Decrease in long-term deferred revenue (18) (18)
Gain on disposal of equipment (9) (14)
Deferred income taxes (1) (3)
Credit gain on available-for-sale securities (1) (2)
Change in current assets and liabilities, net (9,529) (7,801)
Net cash used for operating activities (2,120) (812)
Investing activities:    
Additions to property, plant and equipment (3,322) (1,858)
Proceeds from sale of equipment 9 14
Increase in other assets (8) (104)
Net cash used for investing activities (3,321) (1,948)
Financing activities:    
Proceeds from issuance of Common Stock 1,570 1,285
Payment of contingent consideration obligations (30) (94)
Net cash provided by financing activities 1,540 1,191
Effect of foreign exchange rates on cash (42) 17
Net decrease in cash and cash equivalents (3,943) (1,552)
Cash and cash equivalents at beginning of period 70,557 44,230
Cash and cash equivalents at end of period $ 66,614 $ 42,678