Quarterly report pursuant to Section 13 or 15(d)

Convertible Preferred Stock and Stockholders' Equity - Additional Information (Details)

v3.19.3
Convertible Preferred Stock and Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Nov. 01, 2018
Oct. 23, 2017
Jan. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Dec. 31, 2018
Apr. 24, 2019
Nov. 02, 2018
Class Of Stock [Line Items]                
Authorized capital stock   33,853,333            
Common stock, shares authorized   18,666,666   100,000,000 100,000,000 100,000,000   100,000,000
Capital stock par value   $ 0.001           $ 0.001
Convertible preferred stock               5,000,000
Dividends, value   $ 6,539            
Dividends, fair value $ 10,152              
Preferred shares converted into common stock 13,277,864              
Preferred stock, shares issued         0      
Proceeds from issuance of common stock, net of costs         $ 1,604      
Common stock, shares issued to former employee in exchange for release of claims and other agreements             10,000  
Securities Purchase Agreement                
Class Of Stock [Line Items]                
Common stock, number of shares available for sale               2,089,136
Proceeds from issuance of common stock, net of costs     $ 1,603 $ 8,295        
Issuance cost     $ 30     $ 831    
Common Stock                
Class Of Stock [Line Items]                
Shares issued and sold         227,628      
Common Stock | Securities Purchase Agreement                
Class Of Stock [Line Items]                
Shares issued and sold     227,628     1,270,905    
Common stock, shares issued price per share       $ 7.18   $ 7.18    
Convertible Preferred Stock                
Class Of Stock [Line Items]                
Convertible preferred stock   15,186,664            
Series A-3 Convertible Preferred Stock                
Class Of Stock [Line Items]                
Convertible preferred stock   1,266,666            
Series A-2 Convertible Preferred Stock                
Class Of Stock [Line Items]                
Convertible preferred stock   1,186,666            
Number of shares issued as dividends 49,456              
Series A-1 Convertible Preferred Stock                
Class Of Stock [Line Items]                
Convertible preferred stock   1,733,333            
Number of shares issued as dividends 66,255              
Series A Convertible Preferred Stock                
Class Of Stock [Line Items]                
Convertible preferred stock   9,333,333            
Number of shares issued as dividends 944,694              
Series B Convertible Preferred Stock                
Class Of Stock [Line Items]                
Convertible preferred stock   1,666,666