Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Convertible Preferred Stock and Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 01, 2018
Oct. 23, 2017
Jan. 31, 2019
Dec. 31, 2018
Nov. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Oct. 15, 2019
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   5,000,000 5,000,000     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 $ 8,295      
Common stock, shares issued to former employee in exchange for release of claims and other agreements                 10,000  
Common stock, shares issued to former employee in exchange for timely completion of services               666    
Cumulative dividends paid         $ 32,499   $ 10,152      
Number of warrants issued       156,294   956 156,294      
Preferred stock, conversion description           The conversion rate was one share of common stock for each share of convertible preferred stock and was subject to adjustment for such events such as stock splits and combinations.        
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 costs     $ 30       $ 831      
Common Stock                    
Class Of Stock [Line Items]                    
Shares issued and sold           228,294 1,270,905      
Common Stock | Securities Purchase Agreement                    
Class Of Stock [Line Items]                    
Shares issued and sold     227,628       1,270,905      
Shares issued price per share       $ 7.18     $ 7.18      
Series A-3 Convertible Preferred Stock                    
Class Of Stock [Line Items]                    
Shares issued price per share           $ 8.87        
Percentage of cumulative dividends           5.00%        
Series A-2 Convertible Preferred Stock                    
Class Of Stock [Line Items]                    
Preferred stock, shares issued         105,822          
Shares issued price per share           $ 8.87        
Percentage of cumulative dividends           5.00%        
Series A-1 Convertible Preferred Stock                    
Class Of Stock [Line Items]                    
Preferred stock, shares issued         164,604          
Shares issued price per share           $ 6.03        
Percentage of cumulative dividends           5.00%        
Series A Convertible Preferred Stock                    
Class Of Stock [Line Items]                    
Preferred stock, shares issued         4,467,139          
Shares issued price per share           $ 6.03        
Percentage of cumulative dividends           15.00%        
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                
August 2016 Preferred Stock Agreement                    
Class Of Stock [Line Items]                    
Preferred stock, shares issued           466,014        
Preferred stock, liquidation preference obligation to pay investor           $ 5.22        
Number of warrants issued           466,014