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Restructuring - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 21, 2017
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs incurred to date   $ 12,800   $ 12,800   $ 9,400      
Decrease in number of employees (percent)   50.00%   50.00%         50.00%
Restructuring   $ 2,892 $ 1,992 $ 3,584 $ 3,480 4,030 $ 5,400 $ 0  
Payments for restructuring       1,311   6,551      
Restructuring accrual   $ 500   $ 500   400      
Cash award           $ 800      
Deferred compensation arrangement with individual, requisite service period (in months)           18 months      
Options granted (in shares)   1,179,877 2,183,106   4,015,356 4,386,856      
One-time Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring     $ 1,300   $ 2,300 $ 2,700      
Special Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring     300   300 300      
Fixed Asset Impairment                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring     300   300 400      
Legal Fees                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring     $ 100     600      
Employee Stock Option                  
Restructuring Cost and Reserve [Line Items]                  
Options granted (in shares) 143,000     1,179,877          
Vesting period (in years) 2 years                
December 2016 Restructuring Activities                  
Restructuring Cost and Reserve [Line Items]                  
Number of positions eliminated, percent             30.00%    
Restructuring costs incurred to date   $ 6,900   $ 6,900   6,900      
Decrease in number of employees (percent)             30.00%    
Restructuring           6,900      
Payments for restructuring           4,700      
December 2016 Restructuring Activities | One-time Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs incurred to date           2,400      
Restructuring           2,400      
Payments for restructuring         $ 4,100        
December 2016 Restructuring Activities | Special Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs incurred to date           1,700      
Restructuring           1,700      
December 2016 Restructuring Activities | Fixed Asset Impairment                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs incurred to date           2,000      
Restructuring           2,000      
December 2016 Restructuring Activities | Legal Fees                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs incurred to date           900      
Restructuring           900      
June 2017 Restructuring Activities                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs incurred to date   $ 2,300   $ 2,300   2,300      
Decrease in number of employees (percent)                 50.00%
Restructuring           2,300      
Payments for restructuring           1,900      
June 2017 Restructuring Activities | One-time Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring           1,700      
June 2017 Restructuring Activities | Special Termination Benefits                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring           300      
June 2017 Restructuring Activities | Fixed Asset Impairment                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring           200      
June 2017 Restructuring Activities | Legal Fees                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring           100      
January 2018 Restructuring Announcement                  
Restructuring Cost and Reserve [Line Items]                  
Restructuring costs incurred to date           $ 200