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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Amazon Warrant AB and C
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at at Dec. 31, 2017 $ 395,279   $ 591 $ 471,456 $ (13,748) $ (63,020)
Balance at (in shares) at Dec. 31, 2017     59,057,195      
Stock-based compensation plans            
Grant of restricted stock 0   $ 2 (2)    
Grant of restricted stock (in shares)     198,900      
Issuance of common shares, net of withholdings (2,329)   $ 0 (2,329)    
Withholdings of common shares, net of issuances (in shares)     36,378      
Forfeited restricted stock 0   $ 0 0    
Stock Repurchased and Retired During Period, Shares     (157,000)      
Stock Repurchased and Retired During Period, Value (3,580)   $ (2) (3,578)    
Bond hedge reclassification 50,435     (50,435)    
Note conversion obligation reclassification 50,999     50,999    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2014-09 [Member] 514       514  
Forfeited restricted stock (in shares)     (1,300)      
Amortization of stock awards and restricted stock 5,047     5,047    
Total comprehensive income (loss) 40,943       69,285 (28,342)
Balance at at Dec. 31, 2018 436,438   $ 591 471,158 56,051 (91,362)
Balance at (in shares) at Dec. 31, 2018     59,134,173      
Stock-based compensation plans            
Grant of restricted stock 0   $ 2 (2)    
Grant of restricted stock (in shares)     151,300      
Issuance of common shares, net of withholdings (2,438)   $ 0 (2,438)    
Issuance of common shares, net of withholdings (in shares)     46,958      
Forfeited restricted stock 0   $ 0 0    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | Accounting Standards Update 2016-02 [Member] (71,358)       (71,358)  
Forfeited restricted stock (in shares)     (3,000)      
Amortization of stock awards and restricted stock 7,002     7,002    
Total comprehensive income (loss) 90,698       61,202 29,496
Balance at at Dec. 31, 2019 $ 460,342   $ 593 475,720 45,895 (61,866)
Balance at (in shares) at Dec. 31, 2019 59,329,431   59,329,431      
Stock-based compensation plans            
Grant of restricted stock $ 0   $ 2 (2)    
Grant of restricted stock (in shares)     201,400      
Issuance of common shares, net of withholdings (2,730)   $ 1 (2,731)    
Withholdings of common shares, net of issuances (in shares)     31,005      
Forfeited restricted stock 0   $ 0 0    
Forfeited restricted stock (in shares)     (1,800)      
Amortization of stock awards and restricted stock 7,477     7,477    
Total comprehensive income (loss) 15,325       32,115 (16,790)
Balance at at Dec. 31, 2020 $ 855,497   $ 596 $ 855,547 $ 78,010 $ (78,656)
Balance at (in shares) at Dec. 31, 2020 59,560,036   59,560,036      
Stock-based compensation plans            
reclassification of liability to equity $ 375,083 $ 375,083