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Common Stock - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2020
Feb. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Oct. 14, 2015
Class Of Stock [Line Items]                
Common stock, shares authorized   150,000,000   150,000,000 75,000,000   150,000,000 75,000,000
Common stock, par value   $ 0.00001   $ 0.00001 $ 0.00001     $ 0.00001
Preferred stock, shares authorized               10,000,000
Preferred stock, par value               $ 0.00001
Dividends on common stock       $ 0 $ 0      
Proceeds from issuance of common stock, net of issuance costs       $ 11,288,000   $ 134,596,000    
Jefferies LLC                
Class Of Stock [Line Items]                
Common stock, par value     $ 0.00001          
Issuance of common stock in follow-on offering, net of issuance costs, shares   1,535,217            
Proceeds from issuance of common stock, net of issuance costs   $ 11,300,000            
Percentage of sales commission     3.00%          
Average price   $ 7.62            
Percentage of sales commission and issuance cost   3.00%   3.00%        
Jefferies LLC | Maximum                
Class Of Stock [Line Items]                
Proceeds from issuance of common stock, net of issuance costs     $ 75,000,000          
Common Stock                
Class Of Stock [Line Items]                
Issuance of common stock in follow-on offering, net of issuance costs, shares       1,535,217 150,000 5,867,347    
Proceeds from issuance of common stock, net of issuance costs $ 134,600,000              
Underwriting discounts and commissions and offering expenses $ 9,200,000              
Common Stock | Underwritten Public Offering                
Class Of Stock [Line Items]                
Issuance of common stock in follow-on offering, net of issuance costs, shares 5,867,347              
Common stock price, per share $ 24.50              
Common Stock | Underwriters                
Class Of Stock [Line Items]                
Issuance of common stock in follow-on offering, net of issuance costs, shares 765,306