XML 112 R98.htm IDEA: XBRL DOCUMENT v3.20.4
Stock incentive plans - Plans (Details) - shares
12 Months Ended 60 Months Ended
Dec. 31, 2020
Dec. 31, 2019
2011 Plan    
Stock incentive plans    
Common stock shares reserved for issuance 13,739,820  
2001 Plan    
Stock incentive plans    
Number of options outstanding 0  
Number of awards made 0  
Stock options    
Stock incentive plans    
Number of options outstanding 109,000 235,000
Number of awards made 0 0
Stock options | 2011 Plan    
Stock incentive plans    
Number of options outstanding 109,000 228,000
Stock options | 2001 Plan    
Stock incentive plans    
Number of options outstanding   7,000
RSUs    
Stock incentive plans    
RSUs outstanding 951,000