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Restructuring Charges (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Feb. 28, 2018
employee
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
 [1]
Restructuring Cost and Reserve [Line Items]        
Positions eliminated | employee 110      
Percentage of total workforce 10.00%      
Expected cost   $ 1,865    
Restructuring Reserve [Roll Forward]        
Charges   1,865 $ 0 [1] $ (297)
Cash Restructuring Charges        
Restructuring Reserve [Roll Forward]        
Beginning balance   0    
Charges   1,605    
Payments   (1,605)    
Ending balance   0 0  
Employee termination costs        
Restructuring Cost and Reserve [Line Items]        
Expected cost   1,605    
Employee termination costs | Cash Restructuring Charges        
Restructuring Reserve [Roll Forward]        
Beginning balance   0    
Charges   1,605    
Payments   (1,605)    
Ending balance   0 $ 0  
Non-cash employee termination costs - stock-based compensation        
Restructuring Cost and Reserve [Line Items]        
Expected cost   251    
Other restructuring related costs        
Restructuring Cost and Reserve [Line Items]        
Expected cost   $ 9    
[1] As adjusted for the adoption of ASC 606 using the full retrospective method.