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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ DEFICIT - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive (Loss) Income
Beginning balance, shares (in shares) at Dec. 31, 2021   25 10,538 [1]      
Beginning balance at Dec. 31, 2021 $ (24,854) $ 0 $ 105 $ 770,619 $ (787,047) $ (8,531)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (67,969)       (67,969)  
Foreign currency translation adjustment 2,202         2,202
Adjustment relating to extinguishment of 2022 Notes 1,728     1,728    
Exercise of stock options, vesting of RSUs and stock issued under ESPP (in shares) [1]     310      
Exercise of stock options, vesting of RSUs and stock issued under ESPP 1,190   $ 3 1,187    
Taxes withheld on net settled vesting of RSUs (in shares) [1]     (1)      
Taxes withheld on net settled vesting of RSUs (290)     (290)    
Series E preferred stock dividends 0     2,736 (2,736)  
Share-based compensation 17,875     17,875    
Impact of retroactively adjusted reverse stock split   $ (97) 97    
Ending balance, shares (in shares) at Dec. 31, 2022   25 10,847 [1]      
Ending balance at Dec. 31, 2022 (70,118) $ 0 $ 11 793,952 (857,752) (6,329)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (46,185)       (46,185)  
Foreign currency translation adjustment 1,002         1,002
Exercise of stock options, vesting of RSUs and stock issued under ESPP (in shares) [1]     228      
Exercise of stock options, vesting of RSUs and stock issued under ESPP (305)   $ 3 (308)    
Series E preferred stock dividends 0     2,991 (2,991)  
Issuance of common shares in connection with a public offering, net of issuance costs (in shares) [1]     804      
Issuance of common shares in connection with a public offering, net of issuance costs 6,057   $ 8 6,049    
Share-based compensation 7,444     7,444    
Impact of retroactively adjusted reverse stock split 0   $ (10) 10    
Ending balance, shares (in shares) at Dec. 31, 2023   25 11,879 [1]      
Ending balance at Dec. 31, 2023 $ (102,105) $ 0 $ 12 $ 810,138 $ (906,928) $ (5,327)
[1] Adjusted retroactively for reverse stock split that occurred on January 24, 2024, see Note 1