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Stock-Based Compensation - Stock Option Activity (Narratives) (Details) - Stock Options
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Unrecognized compensation  
Expected unrecognized compensation cost related to unvested stock options (in dollars) $ 0.2
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized 8 months 12 days
Maximum  
Stock-Based Compensation  
Expiration period 7 years
First anniversary vesting  
Stock-Based Compensation  
Vesting percentage 33.33%
Second anniversary vesting  
Stock-Based Compensation  
Vesting percentage 33.33%
Third anniversary vesting  
Stock-Based Compensation  
Vesting percentage 33.33%
Vesting period 3 years