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Income Taxes - Reconciliation From Statutory Federal Income Tax Rate to Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]      
Tax at statutory federal rate 34.00% 34.00% 34.00%
State tax 0.00% 0.00% 0.00%
Stock-based compensation expense (4.60%) (4.60%) (5.70%)
Net operating losses not benefitted (21.70%) (22.40%) (1.60%)
Foreign net operating losses benefitted (7.60%) (7.10%) (26.90%)
Other (0.40%) 0.10% 0.20%
Total (0.30%) 0.00% 0.00%