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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |
Net income | $ 9,345 | $ 8,170 | $ 16,093
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 4,594 | 4,020 | 3,114
Stock-based compensation expense | 3,598 | 1,766 | 1,060
Deferred tax expense (benefit) | (118) | 295 | 2,788
Loss on revaluation of contingent consideration | 4,083 | 2,072 | 91
Loss on disposal of assets | 1 | 35 | 2
Changes in assets and liabilities: |  |  |
Accounts receivable | (3,729) | (1,597) | (774)
Royalties and other receivables | 158 | 6,557 | 2,400
Inventories | (6,149) | (860) | (626)
Prepaid expenses and other current assets | (277) | (820) | 58
Accounts payable | 3,024 | 2,288 | (734)
Accrued liabilities | (1,592) | (2,489) | 1,257
Long-term liabilities | 2,115 | (1,036) | 1,201
Net cash provided by operating activities | 15,053 | 18,401 | 25,930
Cash flows from investing activities: |  |  |
Purchases of marketable securities | (20,168) | (27,508) | (42,480)
Redemptions of marketable securities | 27,587 | 34,804 | 29,209
Acquisition of assets of Refine Technology, LLC |  | (21,236) |
Increase of restricted cash |  | (250) |
Purchases of property, plant and equipment | (2,628) | (5,602) | (4,635)
Net cash provided by (used in) investing activities | 4,791 | (19,792) | (17,906)
Cash flows from financing activities: |  |  |
Exercise of stock options | 866 | 1,680 | 2,450
Excess tax benefit on exercise of stock options |  |  | 72
Payments of contingent consideration | (99) |  |
Net cash provided by financing activities | 767 | 1,680 | 2,522
Effect of exchange rate changes on cash and cash equivalents | (1,882) | (4,756) | 74
Net increase (decrease) in cash and cash equivalents | 18,729 | (4,467) | 10,620
Cash and cash equivalents, beginning of period | 35,363 | 39,830 | 29,210
Cash and cash equivalents, end of period | 54,092 | 35,363 | 39,830
Supplemental information: |  |  |
Income taxes paid | $ 4,948 | $ 2,547 | $ 1,264

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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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=56944662&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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