Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Convertible Preferred Stock and Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended 12 Months Ended
Oct. 23, 2017
Jan. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Dec. 31, 2018
Apr. 24, 2019
Nov. 02, 2018
Nov. 01, 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  
Preferred stock, shares issued       0        
Dividends, value $ 6,539              
Dividends, fair value               $ 10,152
Preferred shares converted into common stock               13,277,864
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   $ 1,604 $ 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