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Condensed Consolidated Statement of Stockholders' Equity Statement - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income, net of tax [Member]
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2018   37,155,906        
Stockholders' Equity Attributable to Parent at Dec. 31, 2018 $ 54,899 $ 42 $ 364,877 $ (13,938) $ (292,708) $ (3,374)
Treasury Stock, Shares - Beginning Balance at Dec. 31, 2018       4,417,585    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   815,976        
Stock Issued During Period, Value, Restricted Stock Award, Gross (18,642) $ 1 (18,643)      
Stock Issued During Period, Shares, Employee Stock Purchase Plans   35,340        
Proceeds from Stock Plans 943   943      
Stock Issued During Period, Shares, Conversion of Convertible Securities   2,176,501        
Stock Issued During Period, Value, Conversion of Convertible Securities 44,811 $ 2 44,809      
Adjustment to additional paid in capital, termination of bond hedge and warrant 64,819   64,819      
Adjustment to additional paid in capital, termination of warrant (45,243)   (45,243)      
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 32,883   32,883      
Adjustments to Additional Paid in Capital, Other (16,445)   (16,445)      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 11,995   11,995      
Other Comprehensive Income (Loss), Net of Tax (92)         (92)
Net Income (Loss) Attributable to Parent (34,434)       (34,434)  
Treasury Stock, Shares - Enging Balance at Jun. 30, 2019       4,417,585    
Stockholders' Equity Attributable to Parent at Jun. 30, 2019 95,494 $ 45 439,995 $ (13,938) (327,142) (3,466)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2019   40,183,723        
Common Stock, Shares, Outstanding, Beginning Balance at Mar. 31, 2019   37,872,661        
Stockholders' Equity Attributable to Parent at Mar. 31, 2019 30,470 $ 42 357,635 $ (13,938) (309,625) (3,644)
Treasury Stock, Shares - Beginning Balance at Mar. 31, 2019       4,417,585    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   134,561        
Stock Issued During Period, Value, Restricted Stock Award, Gross (4,403) $ 1 (4,404)      
Stock Issued During Period, Shares, Conversion of Convertible Securities   2,176,501        
Stock Issued During Period, Value, Conversion of Convertible Securities 44,811 $ 2 44,809      
Adjustment to additional paid in capital, termination of bond hedge and warrant 64,819   64,819      
Adjustment to additional paid in capital, termination of warrant (45,243)   (45,243)      
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt 32,883   32,883      
Adjustments to Additional Paid in Capital, Other (16,445)   (16,445)      
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 5,941   5,941      
Other Comprehensive Income (Loss), Net of Tax 178         178
Net Income (Loss) Attributable to Parent (17,517)       (17,517)  
Treasury Stock, Shares - Enging Balance at Jun. 30, 2019       4,417,585    
Stockholders' Equity Attributable to Parent at Jun. 30, 2019 $ 95,494 $ 45 439,995 $ (13,938) (327,142) (3,466)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2019   40,183,723        
Common Stock, Shares, Outstanding, Beginning Balance at Dec. 31, 2019 42,630,123 42,630,123        
Stockholders' Equity Attributable to Parent at Dec. 31, 2019 $ 164,996 $ 47 560,496 $ (29,847) (361,789) (3,911)
Treasury Stock, Shares - Beginning Balance at Dec. 31, 2019 4,680,723     4,680,723    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   647,401        
Stock Issued During Period, Value, Restricted Stock Award, Gross $ (20,221) $ 1 (20,222)      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 26,774 26,774        
Proceeds from Stock Plans $ 1,364   1,364      
Warrant Exercise, Shares   163        
Warrant Exercise, Value 0          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 12,058   12,058      
Other Comprehensive Income (Loss), Net of Tax (84)         (84)
Net Income (Loss) Attributable to Parent $ (39,943)       (39,943)  
Treasury Stock, Shares - Enging Balance at Jun. 30, 2020 4,680,723     4,680,723    
Stockholders' Equity Attributable to Parent at Jun. 30, 2020 $ 118,170 $ 48 553,696 $ (29,847) (401,732) (3,995)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2020 43,304,461 43,304,461        
Common Stock, Shares, Outstanding, Beginning Balance at Mar. 31, 2020   43,291,660        
Stockholders' Equity Attributable to Parent at Mar. 31, 2020 $ 129,610 $ 48 548,014 $ (29,847) (384,524) (4,081)
Treasury Stock, Shares - Beginning Balance at Mar. 31, 2020       4,680,723    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures   12,801        
Stock Issued During Period, Value, Restricted Stock Award, Gross $ (49)   (49)      
Stock Issued During Period, Shares, Employee Stock Purchase Plans 0          
APIC, Share-based Payment Arrangement, Increase for Cost Recognition $ 5,731   5,731      
Other Comprehensive Income (Loss), Net of Tax 86         86
Net Income (Loss) Attributable to Parent $ (17,208)          
Treasury Stock, Shares - Enging Balance at Jun. 30, 2020 4,680,723     4,680,723    
Stockholders' Equity Attributable to Parent at Jun. 30, 2020 $ 118,170 $ 48 $ 553,696 $ (29,847) $ (401,732) $ (3,995)
Common Stock, Shares, Outstanding, Ending Balance at Jun. 30, 2020 43,304,461 43,304,461