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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Cash flows from operating activities: |  |
Net income (loss) | $ (1,385) | $ (1,068)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Provision for doubtful accounts | 391 | 74
Depreciation and amortization | 6,232 | 3,410
Deferred income taxes | (336) | (227)
Gain (Loss) on Disposition of Property Plant Equipment | 39 | 0
(Gain) Loss on Interest Rate Swaps | (18) | 17
Compensation expense related to stock-based awards and employee stock purchase plan | 1,874 | 1,902
Changes in operating assets and liabilities: |  |
Accounts receivable | 1,794 | (3,251)
Inventories | (2,082) | (1,865)
Prepaid expenses and other assets | (1,679) | (120)
Other non-current assets | 31 | 167
Accounts payable | (3,397) | (1,295)
Deferred revenue | 1,135 | 2,179
Accrued expenses | 2,312 | 1,250
Other long-term liabilities | (7) | 92
Net cash provided by operating activities | 4,904 | 1,265
Cash flows from investing activities: |  |
Capital expenditures | (3,492) | (1,851)
Purchases of marketable securities | (10,649) | (9,287)
Maturities and sales of marketable securities | 7,587 | 14,721
Net cash (used in) provided by investing activities | (6,554) | 3,583
Cash flows from financing activities: |  |
Repayments of long-term debt | (3,088) | (631)
Payments of employee restricted stock withholdings | 344 | 482
Proceeds From Stock Options Exercised and Employee Stock Purchase Plan | 190 | 375
Net cash used in financing activities | (3,242) | (738)
Effect of exchange rate changes on cash and cash equivalents | 69 | (107)
Net (decrease) increase in cash and cash equivalents | (4,823) | 4,003
Cash and cash equivalents at beginning of period | 25,289 | 9,358
Cash and cash equivalents at end of period | $ 20,466 | $ 13,361

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