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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

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
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