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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 loss | $ (33,748) | $ (134,336) | $ (43,053)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Stock-based compensation | 14,981 | 22,546 | 27,996
Depreciation | 15,451 | 13,190 | 11,894
Amortization of intangible assets | 28,909 | 30,345 | 20,191
Non-cash interest expense and amortization of convertible debt issuance costs | 19,296 | 14,695 | 12,622
Impairment of goodwill and long-lived assets | 17,751 | 35,471 | 0
Impairment of investment in non-marketable equity security | 1,400 | 0 | 0
Deferred tax (benefit) provision | 1,919 | 3,728 | (246)
Non-cash restructuring | 653 | 0 | 0
Loss on disposal of property, plant and equipment | 364 | 8 | 0
Gain from sale of intellectual property | (1,388) | 0 | 0
Non-cash acquisition of patents | 0 | 0 | (3,000)
Change in operating assets and liabilities, net of effects of acquisitions: |  |  |
Accounts receivable | (1,722) | 497 | 2,714
Prepaids and other assets | 6,174 | 8,379 | 8,810
Accounts payable | (1,544) | (9,664) | 10,452
Accrued salaries and benefits and other accrued liabilities | (7,114) | 1,847 | (741)
Accrued litigation expenses | (9,324) | (680) | 6,442
Income taxes payable | (716) | (3,522) | (1,047)
Net cash provided by (used in) operating activities | 51,342 | (17,496) | 53,034
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (6,938) | (21,809) | (19,431)
Acquisition of intangible assets | (2,656) | (1,700) | (1,210)
Purchases of marketable securities | (125,554) | (110,716) | (173,996)
Maturities of marketable securities | 119,600 | 183,086 | 337,880
Proceeds from sale of marketable securities | 11,020 | 0 | 33
Proceeds from sale of intellectual property and property, plant and equipment | 2,255 | 0 | 0
Acquisition of businesses, net of cash acquired | 0 | (46,278) | (167,381)
Net cash provided by (used in) investing activities | (2,273) | 2,583 | (24,105)
Cash flows from financing activities: |  |  |
Proceeds from issuance of convertible senior notes | 138,000 | 0 | 0
Issuance costs related to issuance of convertible senior notes | (3,603) | 0 | 0
Proceeds received from issuance of common stock under employee stock plans | 8,391 | 4,103 | 12,282
Payments under installment payment arrangement | (1,829) | (1,923) | (2,531)
Principal payments against financing lease obligation | (178) | (522) | (456)
Payment to redeem contingently redeemable common stock pursuant to the settlement agreement with Samsung | 0 | 0 | (100,000)
Proceeds from landlord for tenant improvements | 0 | 0 | 8,800
Net cash provided by (used in) financing activities | 140,781 | 1,658 | (81,905)
Effect of exchange rate changes on cash and cash equivalents | (138) | (5) | (42)
Net increase (decrease) in cash and cash equivalents | 189,712 | (13,260) | (53,018)
Cash and cash equivalents at beginning of year | 148,984 | 162,244 | 215,262
Cash and cash equivalents at end of year | 338,696 | 148,984 | 162,244
Cash paid during the period for: |  |  |
Interest | 8,625 | 8,625 | 8,625
Income taxes, net of refunds | 18,720 | 16,384 | 16,254
Non-cash investing and financing activities: |  |  |
Non-cash obligation for property, plant and equipment | 0 | 2,512 | 7,409
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities | 5,909 | 1,709 | 3,093
Common stock, net, issued pursuant to acquisition | $ 0 | $ 0 | $ 86,143

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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Adjustment to remove noncash portion of restructuring costs and include cash payments when calculating cash flows from operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6943989&loc=d3e3602-108585 + Details
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