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Income Taxes - Narrative (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Income Tax Disclosure [Abstract] |
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|
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| Provision for income taxes |
$ 17,000 |
$ 51,000 |
$ 43,000 |
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| Provision for foreign tax expense |
16,000 |
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|
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| State |
1,000 |
1,000 |
1,000 |
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| Undistributed earnings of foreign subsidiaries |
300,000 |
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| Valuation allowance |
(35,496,000) |
(29,199,000) |
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| Increase in valuation allowance |
6,300,000 |
2,100,000 |
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| Income Tax Contingency [Line Items] |
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|
|
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| Tax Credit Carryforward, Term |
20 years |
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| Unrecognized tax benefits |
2,656,000 |
1,840,000 |
1,401,000 |
1,067,000 |
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Internal Revenue Service (IRS)
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| Income Tax Contingency [Line Items] |
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| Deferred tax assets, U.S. net operating loss carryforwards |
52,000,000 |
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| Stock-based compensation |
13,900,000 |
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| Operating loss carryforwards, expiration dates |
P2026Y |
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State jurisdiction
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| Income Tax Contingency [Line Items] |
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|
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| Deferred tax assets, U.S. net operating loss carryforwards |
49,200,000 |
|
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| Stock-based compensation |
13,100,000 |
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| Operating loss carryforwards, expiration dates |
P2018Y |
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Research and Development Expense [Member] | Internal Revenue Service (IRS)
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| Income Tax Contingency [Line Items] |
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|
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| Tax Credit Carryforward, Amount |
6,400,000 |
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| Tax Credit Carryforward, Expiration Date |
Dec. 31,
2025 |
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Research and Development Expense [Member] | State jurisdiction
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| Income Tax Contingency [Line Items] |
|
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| Tax Credit Carryforward, Amount |
$ 6,900,000 |
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