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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income tax provision (benefit), Current portion: |  |  |
Federal | $ (5,000) | $ 247,000 | $ (19,000)
State | 3,000 | 3,000 | 2,000
Foreign | 112,000 | 38,000 | 68,000
Total | 110,000 | 288,000 | 51,000
Deferred tax assets: |  |  |
Federal and state loss carryforwards | 30,977,000 | 20,196,000 |
Reserves, accruals and other | 341,000 | 685,000 |
Depreciation and amortization | 1,991,000 | 2,117,000 |
Deferred stock-based compensation | 3,319,000 | 3,061,000 |
Research and development credit carryforwards | 7,476,000 | 6,856,000 |
Foreign tax and other credits | 1,326,000 | 1,347,000 |
Total deferred tax assets | 45,430,000 | 34,262,000 |
Deferred tax liabilities: |  |  |
Acquired intangible assets and other | 1,652,000 | 1,898,000 |
Less: Valuation allowance | (43,778,000) | (32,364,000) |
Increase (decrease) in valuation allowance during the year | 11,400,000 | (2,700,000) |
Valuation allowance related to stock option deductions incurred prior to January 1, 2006, the benefit of which will be credited to additional paid-in capital if they become realized | 1,800,000 |  |
Federal |  |  |
Net operating loss carryforwards |  |  |
Net operating loss carryforwards, amount | 80,600,000 |  |
Net operating loss related to excess tax benefits from stock-based compensation that will be charged to additional paid-in capital when realized | 5,500,000 |  |
State |  |  |
Net operating loss carryforwards |  |  |
Net operating loss carryforwards, amount | 86,500,000 |  |
Net operating loss related to excess tax benefits from stock-based compensation that will be charged to additional paid-in capital when realized | $ 4,700,000 |  |

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