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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Cash flows from operating activities: |  |
Net income | $ 11,506 | $ 5,496
Adjustments to reconcile net income to net cash used in operating activities: |  |
Depreciation and amortization | 3,278 | 2,465
Non-cash interest expense | 1,956 | 382
Stock-based compensation expense | 3,027 | 2,059
Deferred tax expense | (5,384) | 218
Loss on revaluation of contingent consideration |  | 2,642
Gain on sale of fixed assets |  | (15)
Loss on disposal of assets | 64 | 26
Changes in assets and liabilities: |  |
Accounts receivable | (6,347) | 892
Other receivables | 226 | (318)
Inventories | (813) | (5,093)
Prepaid expenses and other current assets | (236) | 793
Other assets | (754) |
Accounts payable | 1,740 | 511
Accrued liabilities | (4,216) | (3,239)
Long-term liabilities | (86) | (66)
Net cash provided by operating activities | 3,961 | 6,753
Cash flows from investing activities: |  |
Acquisition of Atoll GmbH, net of cash received |  | (8,767)
Purchases of marketable securities | (42) | (3,952)
Redemptions of marketable securities | 16,850 | 14,100
Proceeds from sale of fixed assets |  | 45
Purchases of property, plant and equipment | (2,676) | (1,406)
Net cash provided by investing activities | 14,132 | 20
Cash flows from financing activities: |  |
Proceeds from issuance of convertible senior notes, net of costs |  | 111,323
Exercise of stock options | 1,505 | 958
Payment of contingent considerations | (1,677) | (498)
Net cash (used in) provided by financing activities | (172) | 111,783
Effect of exchange rate changes on cash and cash equivalents | 2,053 | (26)
Net increase in cash and cash equivalents | 19,974 | 118,530
Cash and cash equivalents, beginning of period | 122,233 | 54,092
Cash and cash equivalents, end of period | 142,207 | 172,622
Supplemental disclosure of non-cash activities: |  |
Income taxes paid | 2,150 | 1,981
Payment of contingent consideration in common stock | $ 1,062 | 875
Stock tendered for acquisition of Atoll GmbH |  | $ 14,135

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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + 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 (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: 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=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + 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=98514028&loc=d3e3602-108585 + Details
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- Definition The fair value of stock issued in noncash financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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- References No definition available. + Details
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