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Capital Stock and Warrants - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 03, 2021
USD ($)
$ / shares
shares
Aug. 26, 2020
USD ($)
$ / shares
shares
Jan. 15, 2020
USD ($)
shares
Nov. 19, 2019
USD ($)
$ / shares
shares
Dec. 31, 2017
shares
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Apr. 30, 2020
shares
Class of Stock [Line Items]                  
Reverse stock split, conversion ratio     0.025            
Common stock, shares authorized (in shares)     60,000,000       60,000,000 60,000,000  
Gross proceeds from transaction | $       $ 11,500          
Number of securities called by warrants (in shares)       2,875,000     2,361,726    
Warrant liability | $     $ 15,934 $ 24,518          
Gain (loss) from change in fair value or warrants | $     $ 957     $ (9,541) $ 0 $ 957  
Preferred stock, shares authorized             5,000,000 5,000,000  
Preferred stock, par value per share (in dollars per share) | $ / shares             $ 0.01 $ 0.01  
Issuance of preferred stock in connection with private offering (in shares)       5,750       0  
Proceeds from warrants exercised | $             $ 3,856 $ 1,658  
Common Stock                  
Class of Stock [Line Items]                  
Shares issued (in shares)     718,750            
Issuance of stock (in shares)             1,040,000 1,348,285  
Shares issued cumulative (in shares)                 313,000
Warrants exercised (in shares)             481,973    
Series B Warrants                  
Class of Stock [Line Items]                  
Exercise price of warrants (in USD per share) | $ / shares       $ 8.00          
Series A Convertible Preferred Stock                  
Class of Stock [Line Items]                  
Issuance of stock (in shares)         2,504        
Series A Convertible Preferred Stock | Common Stock                  
Class of Stock [Line Items]                  
Issuance of stock (in shares)               99,500  
Class B Units | Series A Warrants                  
Class of Stock [Line Items]                  
Number of securities called by each warrant or right (in shares)       125          
Public offering                  
Class of Stock [Line Items]                  
Common stock issued in offering (in shares) 1,040,000 951,835              
Common stock price (in dollars per share) | $ / shares $ 12.25 $ 4.25              
Gross proceeds | $ $ 12,740 $ 4,045              
Issuance costs | $ $ 747 $ 425              
Registered direct offering                  
Class of Stock [Line Items]                  
Common stock issued in offering (in shares)   396,450              
Common stock price (in dollars per share) | $ / shares   $ 4.25              
Gross proceeds | $   $ 1,685              
Public and private offerings                  
Class of Stock [Line Items]                  
Issuance costs | $       $ 1,254