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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |
Net income | $ 26,647 | $ 6,929
Adjustments to reconcile net income to net cash provided by operations: |  |
Depreciation and amortization expense | 1,917 | 1,243
Amortization of deferred rent | (41) | (23)
Stock-based compensation expense | 241 | 187
Provision for doubtful accounts | 25 | 312
Write-down of inventory to net realizable value | 1,235 | 188
Loss on disposal of assets | 0 | 5
Tax benefit from exercise of stock options | (2) | 0
Changes in operating assets and liabilities: |  |
Receivables | 44 | 1,081
Inventories | 447 | (3,066)
Deferred income taxes | (1,457) | 1,416
Prepaid expenses and other assets | (652) | (305)
Accounts payable | (512) | 634
Accrued liabilities | (130) | (2,277)
Income taxes payable | 14,492 | 250
Deferred product revenue | 189 | (902)
Other long-term liabilities | 1,481 | 127
Net cash provided by operating activities | 43,924 | 5,799
Cash flows from investing activities: |  |
Payment towards business acquisitions | (4,632) | (980)
Purchase of property and equipment | (574) | (380)
Net cash used in investing activities | (5,206) | (1,360)
Cash flows from financing activities: |  |
Proceeds from the exercise of stock options | 490 | 747
Tax benefit from the exercise of stock options | 2 | 66
Treasury stock purchased | (384) | 0
Net cash provided by (used in) financing activities | 108 | 813
Net increase in cash and cash equivalents | 38,826 | 5,252
Cash and cash equivalents at the beginning of the period | 16,683 | 11,431
Cash and cash equivalents at the end of the period | 55,509 | 16,683
Supplemental disclosure of cash flow information: |  |
Cash paid for income taxes | 1,393 | 1,705
Supplemental disclosure of non-cash activities: |  |
Exchanged accounts receivable from a vendor with accounts payable to the same vendor | 0 | 182
Transfer from property and equipment to inventory | $ 0 | $ 78

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