Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Other Commitments and Legal Matters (Details)

v3.19.3.a.u2
Commitments and Contingencies - Other Commitments and Legal Matters (Details)
$ in Millions
Oct. 18, 2018
USD ($)
item
Jul. 18, 2016
item
Jul. 12, 2016
item
Dec. 31, 2015
complaint
Legal matters        
Number of putative securities class action complaints filed against the Company | complaint       2
Number of additional purported shareholder derivative actions filed   2 2  
Regatta Against Company        
Legal matters        
Alleged number of frauds 2      
Regatta Against Executive Vice President        
Legal matters        
Alleged number of frauds 1      
Minimum | Regatta Against Company        
Legal matters        
Claim for general and compensatory damages | $ $ 1.5      
Minimum | Regatta Against Executive Vice President        
Legal matters        
Claim for general and compensatory damages | $ $ 1.5