Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share - Narrative (Details)

v3.20.4
Net Loss Per Share - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 27, 2018
shares
Dec. 26, 2018
shares
Mar. 31, 2020
shares
Dec. 31, 2020
shares
Dec. 31, 2018
shares
Dec. 31, 2019
shares
Subsidiary, Sale of Stock [Line Items]            
Preferred stock, shares authorized (in shares)     2,900,000 5,000,000   5,000,000
Preferred Stock            
Subsidiary, Sale of Stock [Line Items]            
Conversion of preferred stock to common stock (in shares)       (1,600,000)    
Common stock            
Subsidiary, Sale of Stock [Line Items]            
Conversion of preferred stock to common stock (in shares)     8,000,000.0 8,000,000    
Series B convertible preferred stock | Preferred Stock            
Subsidiary, Sale of Stock [Line Items]            
Preferred stock conversion ratio 0.20 0.20   0.20 0.20  
Shares converted (in shares)     1,600,000      
Private Placement | Series B convertible preferred stock | Preferred Stock            
Subsidiary, Sale of Stock [Line Items]            
Preferred stock, shares authorized (in shares) 2,857,143 2,857,143     2,857,143