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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Cash flows from operating activities: |  |
Net income | $ 1,176 | $ 715
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 1,968 | 2,830
Amortization of marketable securities premium | 20 | 23
Impairment charge on equity investee |  | 1,068
Stock-based compensation | 1,284 | 1,126
Provision for doubtful accounts | 43 |
Loss on disposal of equipment |  | 30
Gain from deconsolidation of a subsidiary |  | (175)
Loss from equity method investments, net | 288 | 553
Return on equity method investments |  | 362
Changes in operating assets and liabilities: |  |
Accounts receivable | (854) | 1,304
Inventories | (902) | 8,209
Prepaid expenses and other current assets | (996) | 4,870
Other assets | (1,402) | (3,173)
Accounts payable | 1,538 | (7,330)
Accrued liabilities | (1,352) | (4,664)
Other long-term liabilities, including royalties | 1,172 | 199
Net cash provided by operating activities | 1,983 | 5,947
Cash flows from investing activities: |  |
Purchases of property, plant and equipment | (6,465) | (8,226)
Purchases of available-for-sale securities |  | (2,514)
Proceeds from sales and maturities of available-for-sale debt securities | 3,461 | 16,640
Net cash provided by (used in) investing activities | (3,004) | 5,900
Cash flows from financing activities: |  |
Proceeds from common stock options exercised | 513 | 232
Proceeds from sale of previously consolidated subsidiary shares |  | 366
Consideration paid to repurchase subsidiary shares from noncontrolling interests |  | (262)
Proceeds from short-term loan | 395 |
Dividends paid by joint ventures to their minority shareholders | (89) |
Net cash provided by financing activities | 819 | 336
Effect of exchange rate changes on cash and cash equivalents | (175) | 23
Net increase (decrease) in cash and cash equivalents | (377) | 12,206
Cash and cash equivalents at the beginning of the year | 26,892 | 16,526
Cash and cash equivalents at the end of the year | $ 26,515 | 28,732
Supplemental disclosure of non-cash flow information: |  |
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities |  | 151
Reduction of noncontrolling interests in excess (deficit) of total consideration paid and payable in connection with the repurchase of subsidiary shares from noncontrolling interests |  | $ (74)

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- Definition Amount of return on equity method investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. + References No definition available. + Details
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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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