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Consolidated Statements of Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |
Revenues | $ 42,675 | $ 43,329 | $ 57,767
Cost of revenues | 9,707 | 8,448 | 13,761
Gross profit | 32,968 | 34,881 | 44,006
Operating expenses: |  |  |
Selling and marketing | 15,675 | 16,666 | 26,594
Research and development | 21,305 | 24,767 | 41,711
General and administrative | 18,216 | 20,211 | 25,279
Restructuring expenses | 5,602 | 238 | 3,184
Goodwill and long-lived asset impairment |  |  | 112,904
Total operating expenses | 60,798 | 61,882 | 209,672
Operating loss | (27,830) | (27,001) | (165,666)
Non-operating income: |  |  |
Change in fair value of contingent liability |  | 1,210 |
Interest and other income, net | 30 | 94 | 131
Loss before provision for income taxes | (27,800) | (25,697) | (165,535)
Provision for income tax expense (benefit) | 153 | (234) | (5,929)
Net loss | (27,953) | (25,463) | (159,606)
Other comprehensive income (loss), before tax: |  |  |
Unrealized holding gains (losses) on available-for-sale securities | 7 | 33 | (24)
Income tax expense related to items of other comprehensive income (expense) |  | 6 | 1
Other comprehensive income (expense), net of tax | 7 | 27 | (25)
Comprehensive loss | $ (27,946) | $ (25,436) | $ (159,631)
Net loss per share: |  |  |
Basic and diluted | $ (0.76) | $ (0.71) | $ (4.48)
Weighted average shares outstanding: |  |  |
Basic and diluted | 36,982 | 35,849 | 35,617

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