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Stockholders' Equity - Equity Incentive Plans (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
item
shares
Jun. 30, 2016
shares
Equity Incentive Plans    
Number of equity incentive plans | item 2  
Amended and Restated Equity Incentive Plan (The 1999 Plan)    
Options disclosures    
Granted (in shares) 0  
2015 Plan    
Equity Incentive Plans    
Maximum number of shares authorized to be issued (in shares) 6,150,000  
Options disclosures    
Granted (in shares) 1,900,000 1,600,000
Restricted stock units    
Restricted stock units disclosures    
Aggregate grant date fair value | $ $ 2.4