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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Cash flows from operating activities: |  |  |
Net income (loss) |  | $ 2,942 | $ (728)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization |  | 3,620 | 4,197
Amortization of marketable securities premium |  | 85 | 168
Stock-based compensation |  | 789 | 1,051
Provision for doubtful accounts |  |  | 211
Realized gain on sale of investments |  | (429) | (859)
Loss (gain) on disposal of equipment |  | (5) | 16
Loss (gain) from equity method investments, net |  | 1,437 | (777)
Changes in operating assets and liabilities: |  |  |
Accounts receivable |  | (72) | 363
Inventories |  | (1,092) | 13
Prepaid expenses and other current assets |  | (1,259) | 1,920
Other assets |  | 435 | 329
Accounts payable |  | 949 | (1,053)
Accrued liabilities | [1] | (1,301) | (2,032)
Other long-term liabilities, including royalties |  | (591) | (559)
Net cash provided by operating activities |  | 5,508 | 2,260
Cash flows from investing activities: |  |  |
Purchases of equipment |  | (2,200) | (3,508)
Proceeds from sale of equipment |  | 35 | 2
Purchases of available for sale securities |  | (10,784) | (13,044)
Proceeds from sales and maturities of available-for-sale securities |  | 12,316 | 14,309
Investments in non-marketable equity investments |  |  | (162)
Dividends received from equity method investments |  |  | 286
Net cash used in investing activities |  | (633) | (2,117)
Cash flows from financing activities: |  |  |
Proceeds from common stock options exercised |  | 428 | 165
Repurchases of the Company's common stock, including commission |  |  | (2,254)
Dividends paid by joint ventures to their minority share holders |  | (39) | (102)
Net cash provided by (used in) financing activities |  | 389 | (2,191)
Effect of exchange rate changes on cash and cash equivalents |  | (478) | (581)
Net increase (decrease) in cash and cash equivalents |  | 4,786 | (2,629)
Cash and cash equivalents at the beginning of the period |  | 24,875 | 28,814
Cash and cash equivalents at the end of the period |  | $ 29,661 | $ 26,185
[1] | * Dividend accrued but not paid by joint ventures of $520 and $544 was included in accrued liabilities as of September 30, 2016 and September 30, 2015, respectively.

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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