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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net loss | $ (8,232) | $ (11,034) | $ (7,517)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |  |
Provision for doubtful accounts | 657 | 674 | 872
Depreciation and amortization | 12,857 | 11,037 | 12,564
Deferred income taxes | (781) | (756) | 2,406
Loss on disposals of fixed assets | 17 | 27 | 907
Compensation expense related to stock-based awards and employee stock purchase plan | 3,321 | 3,518 | 3,651
Unrealized currency translation (gain) loss | (377) | (86) | 881
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (2,183) | 2,701 | 10,709
Inventories | (174) | (1,978) | 806
Prepaid expenses, other current assets, and current contract assets | (286) | 1,045 | (332)
Other non-current assets and non-current contract assets | (2,054) | (712) | (2,378)
Accounts payable | 2,041 | 6,711 | (790)
Deferred revenue, contract liabilities, and long-term contract liabilities | (498) | (138) | 1,474
Accrued compensation, product warranty, and other | 874 | 834 | (3,687)
Other long-term liabilities | 2 | (316) | (867)
Net cash provided by operating activities | 5,184 | 11,527 | 18,699
Cash flows from investing activities: |  |  |
Capital expenditures | (15,897) | (12,788) | (5,631)
Cash paid for acquisition of intangible assets | (44) | (83) | 0
Purchases of marketable securities | (2,036) | (11,115) | (13,173)
Maturities and sales of marketable securities | 10,330 | 28,508 | 10,080
Net cash (used in) provided by investing activities | (7,647) | 4,522 | (8,724)
Cash flows from financing activities: |  |  |
Repayments of long-term debt | (182) | (1,649) | (1,358)
Repayments of term note borrowings | (22,507) | (9,350) | (5,281)
Proceeds from stock options exercised and employee stock purchase plan | 484 | 1,644 | 2,583
Payment of employee restricted stock withholdings | 0 | (392) | (313)
Proceeds from line of credit borrowings | 5,000 | 0 | 0
Sale of treasury stock | 4,500 | 0 | 0
Payment of capital lease | (561) | 0 | 0
Other | 0 | 0 | (4)
Net cash used in financing activities | (13,266) | (9,747) | (4,373)
Effect of exchange rate changes on cash and cash equivalents | (817) | 1,872 | (1,899)
Net (decrease) increase in cash and cash equivalents | (16,546) | 8,174 | 3,703
Cash and cash equivalents at beginning of period | 34,596 | 26,422 | 22,719
Cash and cash equivalents at end of period | 18,050 | 34,596 | 26,422
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 1,679 | 1,449 | 1,433
Cash paid for income taxes, net of refunds | 2,578 | 972 | 3,647
Changes in accrued other and accounts payable related to property and equipment additions | 244 | 501 | 345
Deferred purchase price consideration related to asset acquisition included in accrued expenses | 0 | 50 | 0
Satellite hubs acquired under capital lease | $ 3,068 | $ 0 | $ 0

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash inflow 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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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 No definition available. + Details
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- Definition The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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