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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 715 $ 7,741
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,830 2,207
Amortization of marketable securities premium 23 81
Impairment charge on equity investee 1,068  
Stock-based compensation 1,126 931
(Gain) loss on disposal of equipment 30 (13)
Gain from deconsolidation of a subsidiary (175)  
Loss from equity method investments, net 553 27
Return on equity method investments 362  
Changes in operating assets and liabilities:    
Accounts receivable 1,304 61
Inventories 8,209 (11,923)
Prepaid expenses and other current assets 4,870 (2,075)
Other assets (3,173) 59
Accounts payable (7,330) 2,833
Accrued liabilities [1] (4,664) (414)
Other long-term liabilities, including royalties 199 24
Net cash provided by (used in) operating activities 5,947 (461)
Cash flows from investing activities:    
Purchases of property, plant and equipment (8,226) (21,920)
Proceeds from sale of equipment   11
Purchases of available-for-sale securities (2,514) (9,936)
Proceeds from sales and maturities of available-for-sale securities 16,640 17,870
Net cash provided by (used in) investing activities 5,900 (13,975)
Cash flows from financing activities:    
Proceeds from common stock options exercised 232 178
Proceeds from sale of previously consolidated subsidiary shares 366  
Consideration paid to repurchase subsidiary shares from noncontrolling interests (262) (163)
Net cash provided by financing activities 336 15
Effect of exchange rate changes on cash and cash equivalents 23 (233)
Net increase (decrease) in cash and cash equivalents 12,206 (14,654)
Cash and cash equivalents at the beginning of the period 16,526 44,352
Cash and cash equivalents at the end of the period 28,732 29,698
Supplemental disclosure of non-cash flow information:    
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities 151 1,192
Reduction of noncontrolling interests in excess (deficit) of total consideration paid and payable in connection with the repurchase of subsidiaries shares from noncontrolling interests $ (74) $ 196
[1] * Dividend accrued but not paid by one of our consolidated subsidiaries of $0 and $524 was included in accrued liabilities as of June 30, 2019 and 2018, respectively.