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Business and Basis of Presentation - Initial Public Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 29, 2019
Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items]    
Underwriters’ discounts and commissions   $ 5,900
Offering costs   3,700
Reclassification of temporary equity to permanent equity   106,237
Additional Paid in Capital    
Subsidiary, Sale of Stock [Line Items]    
Reclassification of temporary equity to permanent equity   $ 106,230
Common Stock    
Subsidiary, Sale of Stock [Line Items]    
Number of shares issued and sold (in shares)   6,700,000
Conversion of convertible preferred stock to common stock upon initial public offering (in shares)   65,428,088
Reclassification of temporary equity to permanent equity   $ 7
IPO    
Subsidiary, Sale of Stock [Line Items]    
Number of shares issued and sold (in shares) 6,700,000  
Share price (in dollars per share) $ 13.00  
Net proceeds after deducting underwriters’ discounts, commissions, and offering costs $ 77,600  
Underwriters’ discounts and commissions 5,900  
Offering costs $ 3,600  
Conversion of convertible preferred stock to common stock upon initial public offering (in shares) 65,428,088  
Conversion basis (in shares) 1  
IPO | Additional Paid in Capital    
Subsidiary, Sale of Stock [Line Items]    
Reclassification of temporary equity to permanent equity $ 106,200  
IPO | Common Stock    
Subsidiary, Sale of Stock [Line Items]    
Reclassification of temporary equity to permanent equity $ 7  
Selling Shareholders, Including Over-Allotment Option    
Subsidiary, Sale of Stock [Line Items]    
Number of shares issued and sold (in shares) 4,800,000  
Over-Allotment Option    
Subsidiary, Sale of Stock [Line Items]    
Number of shares issued and sold (in shares) 1,500,000