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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |
Net (loss) income | $ (7,517) | $ 2,253 | $ 41
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |
Provision for doubtful accounts | 872 | 1,337 | 1,610
Depreciation and amortization | 12,564 | 12,719 | 9,987
Deferred income taxes | 2,406 | (411) | (1,813)
Loss (gain) on sale of fixed assets | 907 | (4) | 30
Unrealized gain (loss) on derivative instruments | 0 | 57 | 0
Compensation expense related to stock-based awards and employee stock purchase plan | 3,651 | 3,734 | 3,771
Foreign Currency Transaction Gain (Loss), Unrealized | 881 | 391 | 0
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 10,709 | (5,803) | (8,235)
Inventories | 806 | (3,755) | 867
Prepaid expenses and other current assets | (332) | (1,576) | 1,141
Other non-current assets | (2,378) | 1,539 | 569
Accounts payable | (790) | (3,390) | 1,676
Deferred revenue | 1,474 | (1,643) | 1,622
Accrued expenses | (3,687) | 3,023 | (1,002)
Other long-term liabilities | (867) | (74) | 106
Net cash provided by operating activities | 18,699 | 8,397 | 10,370
Cash flows from investing activities: |  |  |
Capital expenditures | (5,631) | (5,694) | (5,118)
Net cash paid for business acquired | 0 | 0 | (43,448)
Purchases of marketable securities | (13,173) | (11,323) | (12,270)
Maturities and sales of marketable securities | 10,080 | 13,217 | 34,150
Net cash used in investing activities | (8,724) | (3,800) | (26,686)
Cash flows from financing activities: |  |  |
Repayments of long-term debt | (1,358) | (1,307) | (1,272)
Repayments of Long-term loan | (5,281) | (4,876) | (1,219)
Proceeds from Long-term loan | 0 | 0 | 65,000
Proceeds from stock options exercised and employee stock purchase plan | 2,583 | 432 | 608
Payment of employee restricted stock withholdings | (313) | (578) | (482)
Repayments of line of credit borrowings | 0 | 0 | (30,000)
Other | (4) | 0 | 41
Net cash (used in) provided by financing activities | (4,373) | (6,329) | 32,676
Effect of exchange rate changes on cash and cash equivalents | (1,899) | (838) | (429)
Net increase in cash and cash equivalents | 3,703 | (2,570) | 15,931
Cash and cash equivalents at beginning of period | 22,719 | 25,289 | 9,358
Cash and cash equivalents at end of period | 26,422 | 22,719 | 25,289
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 1,433 | 1,467 | 1,296
Cash paid for income taxes, net of refunds | 3,647 | 2,182 | 2,470
Changes in Accrued Liabilities Related to Fixed Asset Additions | $ 345 | $ 0 | $ 0

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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: 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=66010992&loc=d3e26853-111562 Reference 2: 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=66902209&loc=d3e3179-108585 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 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 cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: 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 cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + 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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