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Summary of Significant Accounting Policies - Stock-Based Compensation (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Significant Accounting Policies [Line Items]    
Current average expected forfeiture rate (percentage) 8.32% 9.30%
Equity Incentive 2011 Plan [Member]    
Significant Accounting Policies [Line Items]    
Expected term (in years) 6 years 6 years
Weighted average volatility (percentage) 55.47% 42.26%
Weighted average risk free interest rate (percentage) 1.65% 1.80%
Expected dividends 0.00% 0.00%