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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Cash flows from operating activities: |  |  |
Net loss |  | $ (775) | $ (1,274)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Depreciation and amortization |  | 2,808 | 2,819
Amortization of marketable securities premium |  | 113 | 245
Stock-based compensation |  | 740 | 589
Provision for doubtful accounts |  | 211 | 9
Realized gain on sale of investments |  | (859) | 0
Loss (gain) on disposal of property, plant and equipment |  | 9 | (10)
Loss (gain) on equity investments, net |  | (610) | (1,112)
Changes in assets and liabilities: |  |  |
Accounts receivable, net |  | (1,630) | (4,396)
Inventories |  | (262) | 3,783
Prepaid expenses and other current assets |  | 1,954 | 3,300
Other assets |  | 258 | 386
Accounts payable |  | 166 | (1,500)
Accrued liabilities | [1] | (1,602) | 148
Other long-term liabilities |  | (269) | (407)
Net cash provided by operating activities |  | 252 | 2,580
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment |  | (2,174) | (600)
Proceeds from sales of property, plant and equipment |  | 2 | 10
Purchases of available for sale securities |  | (8,664) | (3,728)
Proceeds from sales and maturities of available-for-sale securities |  | 11,752 | 2,922
Investments in non-marketable equity investments |  | (162) | 0
Return of equity method investments |  | 286 | 327
Net cash provided by (used in) investing activities |  | 1,040 | (1,069)
Cash flows from financing activities: |  |  |
Proceeds from common stock options exercised |  | 76 | 6
Repurchases of the Company's common stock, including commission |  | (1,521) | 0
Dividends paid by consolidated joint ventures |  | (80) | (83)
Net cash used in financing activities |  | (1,525) | (77)
Effect of exchange rate changes on cash and cash equivalents |  | 59 | (88)
Net increase (decrease) in cash and cash equivalents |  | (174) | 1,346
Cash and cash equivalents at the beginning of the period |  | 28,814 | 24,961
Cash and cash equivalents at the end of the period |  | $ 28,640 | $ 26,307
[1] | Dividend accrued but not paid by joint ventures of $566 and $647 was included in accrued liabilities as of June 30, 2015 and June 30, 2014, respectively.

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- Definition This item represents the gross loss 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=27724398&loc=d3e27357-111563 + Details
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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=26872669&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=56944662&loc=d3e3602-108585 + Details
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Period Type: | duration

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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=56944662&loc=d3e3602-108585 + Details
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