Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

v3.20.4
Commitments and Contingencies (Details)
1 Months Ended
May 19, 2019
claim
Mar. 13, 2019
claim
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loss Contingencies [Line Items]        
Loss contingency accrual | $     $ 0 $ 0
Karinski v. Stamps.com, Inc. et al, Case 2:19-cv-01828 | Pending Litigation        
Loss Contingencies [Line Items]        
Number of complaints or suits filed   2    
Putative Class Action Complaint        
Loss Contingencies [Line Items]        
Number of claims dismissed   1    
In Re Stamps.com Stockholder Derivative Litigation, Case 2:19-cv-04272 | Pending Litigation        
Loss Contingencies [Line Items]        
Number of complaints or suits filed 2