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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income (loss) $ 4,966 $ (2,533) $ (697)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 4,865 5,494 5,639
Amortization of marketable securities premium 94 218 432
Stock-based compensation 1,096 1,349 1,129
Provision for doubtful accounts 313 211 9
Realized gain on sale of investments (429) (859) (1,263)
Loss (gain) on disposal of equipment 5 17 (13)
Loss (gain) from equity method investments, net 1,995 (462) (1,528)
Changes in operating assets and liabilities:      
Accounts receivable 3,465 (1,076) (2,959)
Inventories (2,959) (45) 479
Prepaid expenses and other current assets (1,223) 1,405 2,393
Other assets 458 542 946
Accounts payable 524 (485) (979)
Accrued liabilities 205 (1,085) 742
Other long-term liabilities, including royalties (871) (813) (833)
Net cash provided by operating activities 12,504 1,878 3,497
Cash flows from investing activities:      
Purchases of equipment (2,728) (4,150) (1,971)
Proceeds from sale of equipment 35 2 13
Purchases of available for sale securities (11,936) (12,787) (11,828)
Proceeds from sales and maturities of available-for-sale securities 13,516 14,309 13,928
Investments in non-marketable equity investments   (162)  
Dividends received from equity method investments   305 327
Net cash provided by (used in) investing activities (1,113) (2,483) 469
Cash flows from financing activities:      
Proceeds from common stock options exercised 1,337 165 134
Repurchases of the Company's common stock, including commission   (2,287)  
Dividends paid by joint ventures to their minority share holders (39) (112) (166)
Net cash provided by (used in) financing activities 1,298 (2,234) (32)
Effect of exchange rate changes on cash and cash equivalents (1,412) (1,100) (81)
Net increase (decrease) in cash and cash equivalents 11,277 (3,939) 3,853
Cash and cash equivalents at the beginning of the period 24,875 28,814  
Cash and cash equivalents at the end of the period 36,152 24,875 28,814
Supplemental disclosures:      
Income taxes paid, net of refunds $ 788 $ 284 $ 293