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Stock-Based Awards - RSUs (Details) - $ / shares
1 Months Ended 12 Months Ended
Jul. 31, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Weighted Average Grant Date Fair Value Per Share        
Weighted average grant date fair value, beginning balance (in dollars per share)   $ 0.00001 $ 0.00001  
Granted, estimated grant-date fair value (in dollars per share) $ 0.00001      
Weighted average grant date fair value, ending balance (in dollars per share)   $ 0.00001 $ 0.00001 $ 0.00001
Weighted average period unrecognized stock-based compensation cost to be recognized (in years)   3 years 6 months 4 days    
Restricted Stock Units (RSUs) [Member]        
RSU Activity        
Granted   53,800    
Units outstanding, end of period   53,800    
Weighted Average Grant Date Fair Value Per Share        
Granted, estimated grant-date fair value (in dollars per share)   $ 28.68    
Weighted average grant date fair value, ending balance (in dollars per share)   $ 28.68    
2015 Equity Incentive Plan | Restricted Stock Units (RSUs) [Member]        
RSU Activity        
Granted     0 0