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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities:    
Consolidated net (loss) income $ (1,731) $ 4,306
Adjustments to reconcile consolidated net (loss) income to net cash used by operating activities:    
Depreciation and amortization 2,711 2,445
Stock-based compensation expense, net 710 773
Provision (benefit) for doubtful accounts 43 (88)
Increase in long-term income taxes payable 4 2
Decrease in long-term deferred revenue (80) (18)
Gain on disposal of equipment   (9)
Deferred income taxes (1) (1)
Credit gain on available-for-sale securities (1) (1)
Change in current assets and liabilities, net (2,639) (9,529)
Net cash used by operating activities (984) (2,120)
Investing activities:    
Additions to property, plant and equipment (2,999) (3,322)
Proceeds from sale of equipment   9
Decrease in other assets 75 (8)
Net cash used for investing activities (2,924) (3,321)
Financing activities:    
Proceeds from issuance of Common Stock 2,061 1,570
Payment of contingent consideration obligations (89) (30)
Net cash provided by financing activities 1,972 1,540
Effect of foreign exchange rates on cash 19 (42)
Net decrease in cash and cash equivalents (1,917) (3,943)
Cash and cash equivalents at beginning of year 84,668 70,557
Cash and cash equivalents at end of year $ 82,751 $ 66,614