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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowances related to U.S. based deferred taxes |  | $ 15,600,000 | $ 27,500,000 |
Valuation allowance | 79,458,000 | 79,458,000 | 63,881,000 |
Research and development tax credits | 87,000 | 87,000 |  |
Statutory federal income tax rate |  | 34.00% | 34.00% | 34.00%
Internal revenue code related to annual use of operating loss carry forwards |  | Annual use of the Company's net operating loss and research and development credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a three-year period. |  |
Internal revenue code, cumulative change in ownership |  | 50.00% |  |
Uncertain income tax position unrecognized |  | Less than a 50% likelihood |  |
Settlements and lapses in statutes of limitations |  | 71,000 | 50,000 |
Associated interest due to expiration of the applicable statutes of limitations for certain tax years |  | 236,000 | 5,000 |
Total liability for unrecognized tax benefits included other long-term liabilities |  | 62,000 | 367,000 |
Recognized tax benefits that would affect the effective tax rate | 62,000 | 62,000 |  |
Interest and penalties related to unrecognized tax benefits in the provision for income taxes |  | 0 | 200,000 |
Expected unrecognized tax benefits due to expiration of limitations applicable to the 2009 taxable year | 62,000 |  |  |
Uncertain tax liability | 552,000 |  |  |
Interest accrual | 236,000 | 236,000 |  |
Domestic Country [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance | 74,700,000 | 74,700,000 | 58,900,000 |
Net operating loss carryforwards | 116,300,000 | 116,300,000 |  |
Net operating loss expiration dates |  | 2026 through 2033 |  |
Research and development tax credit carryforwards | 4,700,000 | 4,700,000 |  |
Tax credits expiration dates |  | 2027 through 2032 |  |
Foreign Country [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance | 4,700,000 | 4,700,000 | 5,000,000 |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 39,300,000 | 39,300,000 |  |
Net operating loss expiration dates |  | 2014 through 2033 |  |
Research and development tax credit carryforwards | $ 5,000,000 | $ 5,000,000 |  |

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