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Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 27, 2016
USD ($)
Aug. 31, 2013
Company
Sep. 30, 2018
USD ($)
Case
States
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Case
States
Sep. 30, 2017
USD ($)
Operating Leases [Abstract]            
Rent expense | $     $ 375 $ 345 $ 998 $ 990
Litigation and Contingencies [Abstract]            
Number of companies patent infringement lawsuits filed | Company   6        
Number of cases resolved         3  
Number of cases pending     2   2  
Number of cases filed         3  
Number of states in the antitrust litigation | States     41   41  
Damages claimed | $ $ 100,000