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Condensed 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 Income (Loss)
Beginning balance (shares) at Dec. 31, 2021   25 105,381      
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 (25,223)       (25,223)  
Foreign currency translation adjustment 2,898         2,898
Adjustment relating to extinguishment of 2022 Notes 1,728     1,728    
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan (shares)     2,008      
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan 76   $ 2 74    
Taxes withheld on net settled vesting of restricted stock units (14)     (14)    
Share-based compensation 11,199     11,199    
Series E preferred stock dividends 0     661 661  
Ending balance (shares) at Mar. 31, 2022   25 107,389      
Ending balance at Mar. 31, 2022 (34,190) $ 0 $ 107 784,267 (812,931) (5,633)
Beginning balance (shares) at Dec. 31, 2022   25 108,468      
Beginning balance at Dec. 31, 2022 (70,118) $ 0 $ 108 793,855 (857,752) (6,329)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss (5,104)       (5,104)  
Foreign currency translation adjustment 94         94
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan (shares)     46      
Exercise of stock options, vesting of restricted stock units and stock issued under employee stock purchase plan 96     96    
Taxes withheld on net settled vesting of restricted stock units (21)     (21)    
Issuance of shares (shares)     858      
Issuance of common shares in connection with a public offering, net of issuance costs 529   $ 1 528    
Share-based compensation 1,800     1,800    
Series E preferred stock dividends 0     723 (723)  
Ending balance (shares) at Mar. 31, 2023   25 109,372      
Ending balance at Mar. 31, 2023 $ (72,724) $ 0 $ 109 $ 796,981 $ (863,578) $ (6,236)