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Condensed Consolidated Statements of Stockholders' Deficit - USD ($)
$ in Thousands
Total
Convertible Note
Mann Group
Convertible Note Interest
Mann Group
2024 Convertible Notes
2024 Convertible Note Interest
At The Market Offering
Common Stock
Common Stock
Convertible Note
Mann Group
Common Stock
Convertible Note Interest
Mann Group
Common Stock
2024 Convertible Notes
Common Stock
2024 Convertible Note Interest
Common Stock
At The Market Offering
Additional Paid-in Capital
Additional Paid-in Capital
Convertible Note
Mann Group
Additional Paid-in Capital
Convertible Note Interest
Mann Group
Additional Paid-in Capital
2024 Convertible Notes
Additional Paid-in Capital
2024 Convertible Note Interest
Additional Paid-in Capital
At The Market Offering
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning Balance at Dec. 31, 2019 $ (190,526)           $ 2,118           $ 2,799,278           $ (19) $ (2,991,903)
Beginning Balance (in shares) at Dec. 31, 2019             211,788,000                          
Issuance of common stock under Employee Stock Purchase Plan 318           $ 3           315              
Issuance of common stock under Employee Stock Purchase Plan (in shares)             333,727                          
Stock-based compensation expense 1,128                       1,128              
Issuance of common stock associated with debt interest payment 144           $ 1           143              
Issuance of common stock associated with debt interest payment (in shares)             99,000                          
Net issuance of common stock associated with stock options and restricted stock units (317)           $ 5           (322)              
Net issuance of common stock associated with stock options and restricted stock units (in shares)             504,000                          
Issuance of common stock           $ 522           $ 4           $ 518    
Issuance of common stock (in shares)                       413,000                
Issuance cost associated with at-the-market offering (16)                       (16)              
Write-off of cumulative translation loss 19                                   $ 19  
Net loss (9,322)                                     (9,322)
Ending Balance at Mar. 31, 2020 (198,050)           $ 2,131           2,801,044             (3,001,225)
Ending Balance (in shares) at Mar. 31, 2020             213,138,000                          
Beginning Balance at Dec. 31, 2020 (180,419)           $ 2,421           2,866,303             (3,049,143)
Beginning Balance (in shares) at Dec. 31, 2020             242,118,000                          
Issuance of common stock under Employee Stock Purchase Plan 390           $ 3           387              
Issuance of common stock under Employee Stock Purchase Plan (in shares)             292,981                          
Stock-based compensation expense 1,935                       1,935              
Net issuance of common stock associated with stock options and restricted stock units 397           $ 4           393              
Net issuance of common stock associated with stock options and restricted stock units (in shares)             390,000                          
Issuance of common stock pursuant to conversion notes   $ 9,573 $ 427 $ 5,000       $ 38 $ 2 $ 17       $ 9,535 $ 425 $ 4,983        
Issuance of common stock pursuant to conversion notes (in shares)               3,830,000 170,000 1,667,000                    
Issuance of common stock pursuant to payoff of the 2024 convertible note interest         $ 143                       $ 143      
Issuance of common stock pursuant to payoff of the 2024 convertible note interest (in shares)                     27,000                  
Issuance of common stock           $ 1,886           $ 6           $ 1,880    
Issuance of common stock (in shares)                       578,000                
Issuance cost associated with at-the-market offering (38)                       (38)              
Net loss (12,916)                                     (12,916)
Ending Balance at Mar. 31, 2021 $ (173,622)           $ 2,491           $ 2,885,946             $ (3,062,059)
Ending Balance (in shares) at Mar. 31, 2021             249,073,000