Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

v3.20.2
Stockholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 23, 2020
Apr. 01, 2020
Mar. 31, 2020
Jan. 30, 2019
Nov. 30, 2019
Aug. 31, 2019
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jan. 31, 2019
Class of Stock [Line Items]                      
Common stock, shares authorized (in shares)             300,000,000 300,000,000   300,000,000  
Common stock, shares issued (in shares)             55,970,580 55,970,580   55,212,437  
Common stock, shares outstanding (in shares)             55,970,580 55,970,580   55,212,437  
Par value of common stock (USD per share)             $ 0.001 $ 0.001   $ 0.001  
Preferred stock, shares authorized (in shares)             10,000,000 10,000,000   10,000,000  
Preferred stock, shares issued (in shares)             14,429 14,429   11,429  
Preferred stock, shares outstanding (in shares)             14,429 14,429   11,429  
Par value of preferred stock (USD per share)             $ 0.001 $ 0.001   $ 0.001  
Number of shares included with each unit (in shares)         1            
Number of warrants included with each unit (in shares)         1            
Gross sales proceeds from common stock           $ 50,000   $ 9,624 $ 0    
Preferred share exchange                      
Class of Stock [Line Items]                      
Shares of stock sold, price per share (in dollars per share)         $ 3.43            
Beneficial conversion feature         $ 2,800            
Private placement                      
Class of Stock [Line Items]                      
Shares of stock sold (in shares)         9,014,960            
Shares of stock sold, price per share (in dollars per share)         $ 3.55            
Shares of stock sold, gross consideration         $ 32,000            
Shares of stock sold, net consideration         $ 31,000            
Stock issued upon conversion (shares)         0.001            
Warrants, exercise price (in dollars per share)         $ 7.10            
Notice period before increase of Beneficial Ownership Limitation         60 days            
At the market offering                      
Class of Stock [Line Items]                      
Shares of stock sold (in shares)             3,571,428        
Shares of stock sold, price per share (in dollars per share)             $ 2.80 $ 2.80      
Shares of stock sold, net consideration             $ 10,000        
Gross sales proceeds from common stock             $ 9,700        
Contractual commission for sales agent             3.00%        
Common Stock                      
Class of Stock [Line Items]                      
Number of securities called by each warrant         1            
Common Stock | Stock exchange, shares from existing shareholders                      
Class of Stock [Line Items]                      
Shares of stock sold (in shares)   3,000,000   5,000,000              
Preferred Stock | Preferred share exchange                      
Class of Stock [Line Items]                      
Preferred stock, shares authorized (in shares)                     5,000
Shares of stock sold (in shares)   3,000   5,000              
Series A Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, shares issued (in shares)             2,907 2,907   2,907  
Preferred stock, shares outstanding (in shares)             2,907 2,907   2,907  
Series B Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, shares issued (in shares)             5,000 5,000   5,000  
Preferred stock, shares outstanding (in shares)             5,000 5,000   5,000  
Series C Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, shares issued (in shares)             3,522 3,522   3,522  
Preferred stock, shares outstanding (in shares)             3,522 3,522   3,522  
Series D Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, shares issued (in shares)             3,000 3,000   0  
Preferred stock, shares outstanding (in shares)             3,000 3,000   0  
Series D Preferred Stock | Preferred Stock                      
Class of Stock [Line Items]                      
Preferred stock, shares authorized (in shares)   3,000                  
Par value of preferred stock (USD per share)     $ 0.001                
Stock issued upon conversion (shares)     1,000                
Notice period before increase of Beneficial Ownership Limitation     61 days                
Common stock ownership limit (as a percent)     9.99%                
Beneficial ownership limitation (as a percent)     19.99%                
2020 Employee, Director and Consultant Equity Incentive Plan                      
Class of Stock [Line Items]                      
Shares of stock authorized pursuant to the 2020 Plan (shares) 3,500,000                    
2019 Plan                      
Class of Stock [Line Items]                      
Shares of stock terminated under the 2019 Plan (shares) 1,579,678                    
Maximum | Private placement                      
Class of Stock [Line Items]                      
Warrants, term         5 years