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Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Reconciliation of the total income tax provision tax rate [Abstract] |  |  |
Income tax expense (benefit) at federal statutory rate (in hundredths) | (34.00%) | (34.00%) | (34.00%)
Income tax expense (benefit) at state statutory rate (in hundredths) | (2.79%) | (3.36%) | (2.62%)
Mark to market permanent adjustment (in hundredths) | (0.24%) | (5.02%) | (1.71%)
Change in federal valuation allowance (in hundredths) | 35.86% | 45.72% | 40.47%
Change in State Rate (in hundredths) | (8.36%) | (3.29%) | 0.00%
Deferred revenue (in hundredths) | 0.00% | (2.09%) | (2.82%)
Foreign rate differential (in hundredths) | (0.04%) | 0.00% | 0.00%
Other, net (in hundredths) | 9.57% | 2.04% | 0.68%
Total income tax provision (in hundredths) | 0.00% | 0.00% | 0.00%
Deferred tax assets [Abstract] |  |  |
Allowances and reserves | $ 169,000 | $ 292,000 |
Accrued expenses | 1,053,000 | 587,000 |
Deferred revenue | 1,138,000 | 3,276,000 |
Stock based compensation | 5,635,000 | 4,886,000 |
Net operating loss carryforwards | 87,045,000 | 73,774,000 |
Income tax credit carryforwards | 5,729,000 | 5,569,000 |
Property and equipment, principally due to differences in depreciation | 422,000 | 707,000 |
Other | 295,000 | 181,000 |
Deferred tax assets (Total) | 101,486,000 | 89,272,000 |
Valuation allowance | (101,476,000) | (89,200,000) |
Total deferred tax assets, net of allowance | 10,000 | 72,000 |
Deferred tax liabilities [Abstract] |  |  |
Intangibles | (10,000) | (72,000) |
Total deferred tax liability | (10,000) | (72,000) |
Net deferred tax assets (liability) | 0 | 0 |
Schedule of reconciliation of unrecognized tax benefits activity [Roll Forward] |  |  |
Unrecognized Tax Benefits - Beginning | 1,304,000 | 1,166,000 | 1,115,000
Gross increases - tax positions in prior period | 0 | 0 | 0
Gross decreases - tax positions in prior period | 0 | 0 | (49,000)
Gross increase - current-period tax positions | 90,000 | 138,000 | 100,000
Settlements | 0 | 0 | 0
Lapse of statute of limitations | 0 | 0 | 0
Unrecognized Tax Benefits - Ending | 1,394,000 | 1,304,000 | 1,166,000
Income Tax Contingency [Line Items] |  |  |
Increased valuation allowance | 12,276,000 |  |
Net operating loss carryforwards, Expire date | expire in 2019 and 2013 |  |
Federal tax carry forward | 4,096,000 |  |
State tax credit carryforwards | 4,244,000 |  |
Cumulative change in ownership (in hundredths) | 50.00% |  |
Period of net operating loss and R&D tax credit carry forwards to offset future taxable income | 3 years |  |
Excess tax benefits | 1,169,000 |  |
Period for material changes of liability for uncertain tax benefits | 12 months |  |
Japan [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Foreign tax loss carryforward | 11,730,000 |  |
Switzerland [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Foreign tax loss carryforward | 1,632,000 |  |
India [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Foreign tax loss carryforward | 78,000 |  |
Federal [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax loss carryforwards | 222,237,000 |  |
California [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax loss carryforwards | 137,500,000 |  |
Massachusetts [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Tax loss carryforwards | 671,000 |  |
Stock Option [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Increased valuation allowance | $ 579,000 |  |

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