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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Cash flows from operating activities: |  |
Net income (loss) | $ (2,791) | $ (1,422)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Provision for doubtful accounts | 403 | 502
Depreciation and amortization | 3,189 | 3,129
Deferred income taxes | 13 | (426)
Gain (Loss) on Disposition of Property Plant Equipment | 256 | 39
(Gain) loss on derivative instruments | (19) | 13
Compensation expense related to stock-based awards and employee stock purchase plan | 1,052 | 958
Foreign Currency Transaction Gain (Loss), Unrealized | 536 | 0
Changes in operating assets and liabilities: |  |
Accounts receivable | 11,516 | 734
Inventories | (1,572) | (1,214)
Prepaid expenses and other assets | (1,167) | (565)
Other non-current assets | (525) | (428)
Accounts payable | (1,123) | (813)
Deferred revenue | 894 | 5,418
Accrued expenses | (1,986) | (2,710)
Other long-term liabilities | (38) | (11)
Net cash provided by operating activities | 8,638 | 3,204
Cash flows from investing activities: |  |
Capital expenditures | (1,276) | (1,270)
Purchases of marketable securities | (2,306) | (9,625)
Maturities and sales of marketable securities | 2,286 | 3,095
Net cash used in investing activities | (1,296) | (7,800)
Cash flows from financing activities: |  |
Repayments of long-term debt | (334) | (324)
Repayments of Long-term loan | 1,219 | 1,219
Payments of employee restricted stock withholdings | 325 | 344
Proceeds From Stock Options Exercised and Employee Stock Purchase Plan | 146 | 197
Net cash used in financing activities | (1,732) | (1,690)
Effect of exchange rate changes on cash and cash equivalents | (131) | (624)
Net increase (decrease) in cash and cash equivalents | 5,479 | (6,910)
Cash and cash equivalents at beginning of period | 22,719 | 25,289
Cash and cash equivalents at end of period | $ 28,198 | $ 18,379

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