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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
December 2020 Offering [Member]
June 2019 Offering [Member]
September 2019 Offering [Member]
June 2018 Warrants [Member]
May 2020 Warrants Transaction [Member]
May 2020 Warrants [Member]
March 2018 PIPE [Member]
July 2020 Warrants Transaction [Member]
July 2020 Warrants [Member]
Common Stock [Member]
Common Stock [Member]
December 2020 Offering [Member]
Common Stock [Member]
June 2019 Offering [Member]
Common Stock [Member]
September 2019 Offering [Member]
Common Stock [Member]
June 2018 Warrants [Member]
Common Stock [Member]
March 2018 PIPE [Member]
Additional Paid-In Capital [Member]
Additional Paid-In Capital [Member]
December 2020 Offering [Member]
Additional Paid-In Capital [Member]
June 2019 Offering [Member]
Additional Paid-In Capital [Member]
September 2019 Offering [Member]
Additional Paid-In Capital [Member]
June 2018 Warrants [Member]
Additional Paid-In Capital [Member]
May 2020 Warrants Transaction [Member]
Additional Paid-In Capital [Member]
May 2020 Warrants [Member]
Additional Paid-In Capital [Member]
March 2018 PIPE [Member]
Additional Paid-In Capital [Member]
July 2020 Warrants Transaction [Member]
Additional Paid-In Capital [Member]
July 2020 Warrants [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Non-controlling Interest [Member]
Stockholders Equity, Beginning Balance at Dec. 31, 2018 $ 12,815                   $ 45           $ 191,136                   $ (178,366)    
Stockholders Equity, Beginning Balance, Shares at Dec. 31, 2018                     4,774,919                                    
Issuance of shares related to employee stock purchase plan 18                               18                        
Issuance of shares related to employee stock purchase plan, Shares                     8,536                                    
Issuance of shares related to employee stock option exercises $ 3                               3                        
Issuance of shares related to employee stock option exercises, Shares 546                   546                                    
Issuance of shares and warrants     $ 3,303 $ 6,571                 $ 2 $ 1         $ 3,301 $ 6,570                  
Issuance of shares and warrants, Shares                         1,489,575 1,318,828                              
Offering costs     (489) (808)                             (489) (808)                  
Issuance of placement agent warrants     198 $ 326                             198 $ 326                  
Issuance of shares related to the exercise of warrants     $ 5,269                   $ 1           $ 5,268                    
Issuance of shares related to the exercise of warrants, Shares                         1,053,745                                
Reclassification of common stock warrant liability balance with exercise $ 7,016                               7,016                        
Stock-based compensation 2,287                               2,287                        
Non-controlling interest contributions 689                                                       $ 689
Unrealized (losses) gains on investment securities 1                                                     $ 1  
Net loss (28,873)                                                   (28,805)   (68)
Stockholders Equity, Ending Balance at Dec. 31, 2019 8,326                   $ 49           214,826                   (207,171) 1 621
Stockholders Equity, Ending Balance, Shares at Dec. 31, 2019                     8,646,149                                    
Issuance of shares related to employee stock purchase plan 51                               51                        
Issuance of shares related to employee stock purchase plan, Shares                     19,667                                    
Issuance of shares         $ 5,569     $ 2,444             $ 1 $ 1         $ 5,568     $ 2,443          
Issuance of shares, Shares                             1,392,345 641,416                          
Issuance of shares and warrants   $ 8,000                   $ 3           $ 7,997                      
Issuance of shares and warrants, Shares                       2,618,658                                  
Offering costs   (939)                               (939)                      
Issuance of investor warrants           $ 4,415     $ 2,059                         $ 4,415     $ 2,059        
Issuance of placement agent warrants   $ 287         $ 215     $ 101               $ 287         $ 215     $ 101      
Shares of common stock issued at closing of ISI transaction 432                               432                        
Shares of common stock issued at closing of ISI transaction, Shares                     132,626                                    
Stock-based compensation 2,042                               2,042                        
Non-controlling interest contributions 1,578                                                       1,578
Unrealized (losses) gains on investment securities (1)                                                     $ (1)  
Net loss (6,026)                                                   (4,655)   (1,371)
Stockholders Equity, Ending Balance at Dec. 31, 2020 $ 28,552                   $ 54           $ 239,496                   $ (211,825)   $ 827
Stockholders Equity, Ending Balance, Shares at Dec. 31, 2020                     13,450,861