Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v3.19.1
Commitments and Contingencies (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
claim
Dec. 31, 2018
USD ($)
Non-Income Tax Contingencies    
Commitments and contingencies    
Accrued liabilities $ 300,000 $ 300,000
Value-added tax assessments and other civil litigation    
Commitments and contingencies    
Minimum number of claims that insurance coverage may not cover | claim 1  
Accrued liabilities $ 1,900,000 $ 1,700,000
Provision for losses 0  
Minimum | Non-Income Tax Contingencies    
Commitments and contingencies    
Estimate of possible loss 0  
Minimum | Value-added tax assessments and other civil litigation    
Commitments and contingencies    
Estimate of possible loss 0  
Maximum | Non-Income Tax Contingencies    
Commitments and contingencies    
Estimate of possible loss 3,400,000  
Maximum | Value-added tax assessments and other civil litigation    
Commitments and contingencies    
Estimate of possible loss $ 400,000