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Income Taxes - Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 25,837 | $ 83,082
Deferred tax liabilities: |  |
Less: valuation allowance | (21,221) | (44,478)
45.43% and 45.22% Tax Rate [Member] |  |
Deferred tax assets: |  |
Net operating losses | 11,738 | 37,571
Stock-based compensation | 7,579 | 6,471
Fixed assets |  | 286
Deferred rent liability | 1,855 | 68
Other | 82 | 82
Total gross deferred tax assets | 21,254 | 44,478
Deferred tax liabilities: |  |
Fixed assets | 7 |
Unrealized gains | 26 |
Deferred tax liabilities | 33 |
Total deferred tax assets less deferred tax liabilities | 21,221 | 44,478
Less: valuation allowance | (21,221) | (44,478)
Net deferred tax assets and liabilities |  |

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