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Consolidated Statements of Cash Flows (Unaudited) (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Cash flows from operating activities: |  |
Net income | $ 4,898,000 | $ 823,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Provision for doubtful accounts | 726,000 | 556,000
Depreciation and amortization | 4,301,000 | 3,377,000
Deferred income taxes | 923,000 | 1,697,000
(Gain) loss on derivative instruments | (73,000) | 95,000
Compensation expense related to stock-based awards and employee stock purchase plan | 2,988,000 | 2,747,000
Changes in operating assets and liabilities: |  |
Accounts receivable | 3,573,000 | (3,197,000)
Inventories | (1,831,000) | 778,000
Prepaid expenses and other assets | (84,000) | (257,000)
Other non-current assets | (387,000) | (442,000)
Accounts payable | 278,000 | 467,000
Deferred revenue | 796,000 | (723,000)
Accrued expenses | (117,000) | 3,493,000
Other long-term liabilities | 982,000 | (3,000)
Net cash provided by operating activities | 16,973,000 | 9,411,000
Cash flows from investing activities: |  |
Capital expenditures | (3,031,000) | (5,240,000)
Net cash paid for business acquired | (22,943,000) | 0
Purchases of marketable securities | (35,221,000) | (13,106,000)
Maturities and sales of marketable securities | 16,166,000 | 12,361,000
Net cash used in investing activities | (45,029,000) | (5,985,000)
Cash flows from financing activities: |  |
Repayments of long-term debt | (772,000) | (98,000)
Borrowings from long-term debt | 4,671,000 | 0
Proceeds from stock options exercised and employee stock purchase plan | 2,360,000 | 784,000
Payment of employee restricted stock withholdings | (828,000) | (333,000)
Repayments of line of credit borrowings | 0 | (2,000,000)
Proceeds from line of credit borrowings | 23,000,000 | 0
Payment of stock registration fee | (5,000) | 0
Net cash provided by (used in) financing activities | 28,426,000 | (1,647,000)
Effect of exchange rate changes on cash and cash equivalents | (135,000) | (175,000)
Net increase in cash and cash equivalents | 235,000 | 1,604,000
Cash and cash equivalents at beginning of period | 8,978,000 | 7,017,000
Cash and cash equivalents at end of period | $ 9,213,000 | $ 8,621,000

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