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Basis of Presentation and Significant Accounting Policies - Stock-Based Compensation (Additional Information) (Details)
6 Months Ended
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock-based compensation vesting period 5 years
Minimum | RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Time-based condition, period 6 months
Maximum | RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Time-based condition, period 2 years