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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating activities: |  |  |
Net income (loss) | $ (25,463) | $ (159,606) | $ 12,346
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities, net of the effect of acquisitions: |  |  |
Depreciation and amortization | 4,430 | 10,177 | 11,778
Goodwill and long-lived asset impairment |  | 112,904 |
Change in fair value of contingent liability | (1,210) |  |
Loss on disposal of fixed assets | 163 | 181 | 29
Lease incentives |  | 2,223 |
Provision for adjustments to accounts receivable and doubtful accounts | 1,045 | 1,244 | 851
Provision for excess and obsolete inventory | 73 | 158 | 203
Tax benefits from stock-based compensation |  |  | (1,543)
Non cash compensation related to stock options and restricted stock | 3,949 | 6,530 | 9,496
Deferred income taxes |  | 414 | 849
Change in operating accounts, net of effect from acquisitions: |  |  |
Accounts receivable | (1,473) | 20,043 | (6,516)
Income tax receivable | 7,612 | (5,421) | (1,892)
Inventories | 60 | (97) | (167)
Prepaid expenses and other assets | 268 | 58 | 259
Accounts payable and accrued liabilities | (2,259) | (2,355) | (949)
Net cash provided by (used in) operating activities | (12,805) | (13,547) | 24,744
Investing activities: |  |  |
Acquisitions, net of cash received |  |  | (532)
Capital expenditures | (322) | (13,431) | (6,312)
Sale (purchase) of short-term investments | 25,196 | 16,172 | (23,418)
Net cash provided by (used in) investing activities | 24,874 | 2,741 | (30,262)
Financing activities: |  |  |
Tax benefits from stock-based compensation |  |  | 1,543
Cash received from stock sale for employee stock purchase plan | 66 | 413 |
Cash received from exercise of stock options | 16 | 12 | 7,254
Repurchase of common stock | (753) |  |
Net cash provided by (used in) financing activities | (671) | 425 | 8,797
Net increase (decrease) in cash and cash equivalents | 11,398 | (10,381) | 3,279
Cash and cash equivalents, beginning of period | 7,475 | 17,856 | 14,577
Cash and cash equivalents, end of period | 18,873 | 7,475 | 17,856
Supplemental disclosures of cash flow information: |  |  |
Cash paid for income taxes | $ 257 | $ 700 | $ 5,776

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