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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jul. 12, 2018
Loss Contingencies [Line Items]    
Percentage of royalty obligations, majority are less than 3.00%  
Minimum    
Loss Contingencies [Line Items]    
Percentage of royalty obligations 0.50%  
Maximum    
Loss Contingencies [Line Items]    
Percentage of royalty obligations 5.00%  
Subsequent Event | Threatened Litigation    
Loss Contingencies [Line Items]    
Estimate of potential loss from litigation   $ 510