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Consolidated Statements of Stockholders' Deficit - USD ($)
shares in Thousands, $ in Thousands
Total
2022 Notes
2025 Notes
Series E preferred shares
Common stock
Preferred Stock
Preferred Stock
Series E preferred shares
Common Stock
Common Stock
2022 Notes
Common Stock
2025 Notes
Common Stock
Common stock
Additional Paid-in Capital
Additional Paid-in Capital
2022 Notes
Additional Paid-in Capital
2025 Notes
Additional Paid-in Capital
Series E preferred shares
Additional Paid-in Capital
Common stock
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Beginning balance at Dec. 31, 2018 $ (36,525)         $ 0   $ 74       $ 546,230         $ (577,817) $ (4,877) $ (135)
Beginning balance, shares (in shares) at Dec. 31, 2018           0   73,980                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Net loss (40,110)                               (40,125)   15
Foreign currency translation adjustment 998                                 998  
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan 3,265             $ 2       3,263              
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan (in shares)               2,254                      
Taxes withheld on net settled vesting of restricted stock units (1,269)                     (1,269)              
Issuance of shares       $ 10,000 $ 1,439           $ 0       $ 10,000 $ 1,439      
Issuance of shares (in shares)             10       263                
Exercise of warrants 17,542             $ 6       17,536              
Exercise of warrants (in shares)               5,477                      
Share-based compensation 7,302                     7,302              
Series E preferred stock dividends 0                     361         (361)    
Ending balance at Dec. 31, 2019 (37,358)         $ 0   $ 82       584,862         (618,303) (3,879) (120)
Ending balance, shares (in shares) at Dec. 31, 2019           10   81,974                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                      
Net loss (111,186)                               (111,215)   29
Foreign currency translation adjustment (3,093)                                 (3,093)  
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan 5,422             $ 2       5,420              
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan (in shares)               2,081                      
Taxes withheld on net settled vesting of restricted stock units (354)                     (354)              
Issuance of shares       25,000                     25,000        
Issuance of shares (in shares)             25                        
Issuance of Series E preferred stock in lieu of interest       $ 2,330                     $ 2,330        
Issuance of Series E preferred stock in lieu of interest (in shares)             2                        
Repurchase of Series E preferred stock (2,354)                     (2,354)              
Repurchase of Series E preferred stock (in shares)           (2)                          
Issuance of common shares under settlement   $ 66,088 $ 14,354           $ 14 $ 1     $ 66,074 $ 14,353          
Issuance of common shares under settlement (in shares)                 13,739 1,177                  
Exercise of warrants 1,861             $ 0       1,861              
Exercise of warrants (in shares)               338                      
Share-based compensation 10,419                     10,419              
Series E preferred stock dividends 0                     2,904         (2,904)    
Issuance of common shares under settlement agreement 972                     972              
Issuance of common shares under settlement (in shares)               90                      
Ending balance at Dec. 31, 2020 $ (27,899)         $ 0   $ 99       $ 711,487         $ (732,422) $ (6,972) $ (91)
Ending balance, shares (in shares) at Dec. 31, 2020           35   99,399