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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