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Description of Business (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 16, 2017
USD ($)
class
vote
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Aug. 03, 2019
USD ($)
Jul. 28, 2018
USD ($)
Jul. 29, 2017
USD ($)
Nov. 17, 2017
shares
Subsidiary, Sale of Stock [Line Items]            
Number of new classes of common stock authorized | class 2          
Common stock, conversion ratio 1          
Offering costs | $     $ 0 $ 0 $ 1,879  
Preferred stock, shares outstanding (in shares)           0
Warrants outstanding (in shares)           0
Class A common stock            
Subsidiary, Sale of Stock [Line Items]            
Number of votes per share | vote 1          
Class A common stock | IPO            
Subsidiary, Sale of Stock [Line Items]            
Number of shares issued (in shares) 8,000,000          
Price per share (in dollars per share) | $ / shares $ 15.00          
Net proceeds after underwriting discounts and offering costs | $ $ 110,400          
Underwriting discounts | $ 6,200          
Offering costs | $ $ 3,400          
Class A common stock | Over-allotment option            
Subsidiary, Sale of Stock [Line Items]            
Number of shares issued (in shares)   1,175,557        
Price per share (in dollars per share) | $ / shares   $ 15.00        
Net proceeds after underwriting discounts and offering costs | $   $ 16,700        
Class B common stock            
Subsidiary, Sale of Stock [Line Items]            
Number of votes per share | vote 10          
Class B common stock | IPO            
Subsidiary, Sale of Stock [Line Items]            
Number of shares converted as a result of the IPO (in shares) 59,511,055          
Number of shares automatically exercised as a result of the IPO (in shares) 1,066,225