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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
Operating activities: |  |  |
Net loss | $ (27,953) | $ (25,463) | $ (159,606)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation and amortization | 4,006 | 4,430 | 10,177
Long-lived assets write-off due to restructuring | 1,011 |  |
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
Lease incentives |  |  | 2,223
Provision for adjustments to accounts receivable and doubtful accounts | 730 | 1,045 | 1,244
Provision for excess and obsolete inventory | 76 | 73 | 158
Non cash compensation related to stock options and restricted stock | 3,533 | 3,949 | 6,530
Deferred income taxes |  |  | 414
Change in operating accounts: |  |  |
Accounts receivable | 660 | (1,473) | 20,043
Income tax receivable | (18) | 7,612 | (5,421)
Inventories | (67) | 60 | (97)
Prepaid expenses and other assets | (9) | 268 | 58
Accounts payable and accrued liabilities | 1,457 | (2,259) | (2,355)
Net cash used in operating activities | (16,574) | (12,805) | (13,547)
Investing activities: |  |  |
Capital expenditures | (829) | (322) | (13,431)
Sales of short-term investments | 10,257 | 25,196 | 16,172
Net cash provided by investing activities | 9,428 | 24,874 | 2,741
Financing activities: |  |  |
Cash received from stock sale for employee stock purchase plan | 36 | 66 | 413
Cash received from exercise of stock options |  | 16 | 12
Repurchase of common stock |  | (753) |
Net cash provided by (used in) financing activities | 36 | (671) | 425
Net increase (decrease) in cash and cash equivalents | (7,110) | 11,398 | (10,381)
Cash and cash equivalents, beginning of period | 18,873 | 7,475 | 17,856
Cash and cash equivalents, end of period | 11,763 | 18,873 | 7,475
Supplemental disclosures of cash flow information: |  |  |
Cash paid for income taxes | $ 165 | $ 257 | $ 700

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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