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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net income | $ 4,533 | $ 3,580 | $ 860
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Provision for doubtful accounts | 1,305 | 536 | 276
Depreciation and amortization | 5,994 | 4,610 | 4,374
Deferred income taxes | (713) | 2,046 | (737)
(Gain) loss on derivatives instruments | (222) | 128 | 131
Compensation expense related to stock-based awards and employee stock purchase plan | 4,124 | 3,679 | 3,533
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 1,229 | (2,231) | (7,438)
Inventories | (1,967) | 2,420 | (3,851)
Prepaid expenses and other assets | 619 | (716) | 164
Other non-current assets | (675) | (558) | 2,028
Accounts payable | 1,196 | 943 | 2,223
Deferred revenue | (124) | (785) | 1,684
Accrued expenses | 891 | 1,401 | (253)
Other long-term liabilities | 65 | 4 | (1,127)
Net cash provided by operating activities | 16,255 | 15,057 | 1,867
Cash flows from investing activities: |  |  |
Capital expenditures | (4,720) | (6,504) | (14,064)
Net cash paid for business acquired | (22,944) | 0 | 0
Purchases of marketable securities | (41,950) | (21,945) | (49,541)
Maturities and sales of marketable securities | 24,867 | 16,190 | 56,053
Net cash used in investing activities | (44,747) | (12,259) | (7,552)
Cash flows from financing activities: |  |  |
Repayments of long-term debt | (1,030) | (131) | (124)
Borrowings from long-term debt | 5,844 | 0 | 0
Proceeds from stock options exercised and employee stock purchase plan | 2,344 | 1,578 | 942
Repurchase of common stock | 0 | 0 | (3,679)
Payment of employee restricted stock withholdings | (828) | (332) | (625)
Repayments of line of credit borrowings | 0 | (2,000) | 0
Proceeds from line of credit borrowings | 23,000 | 0 | 9,000
Payment of stock registration fee | (5) | 0 | (10)
Net cash provided by (used in) financing activities | 29,325 | (885) | 5,504
Effect of exchange rate changes on cash and cash equivalents | (453) | 48 | (43)
Net increase (decrease) in cash and cash equivalents | 380 | 1,961 | (224)
Cash and cash equivalents at beginning of period | 8,978 | 7,017 | 7,241
Cash and cash equivalents at end of period | 9,358 | 8,978 | 7,017
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest | 601 | 201 | 267
Cash paid for income taxes | 1,248 | 323 | 58
Supplemental disclosure of noncash investing activity: |  |  |
Changes in accrued liabilities related to fixed asset additions | $ 0 | $ 435 | $ 945

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