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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
Total
Common Stock
Common Stock Warrants
Additional Paid-in Capital
Accumulated Earnings (Deficit)
Beginning Balance at Dec. 31, 2013 $ 952,005,000 $ 4,768,000   $ 499,888,000 $ 447,349,000
Beginning Balance, Shares at Dec. 31, 2013   9,536,000      
Stock-based compensation 10,697,000 $ 31,000   10,666,000  
Stock-based compensation, Shares   62,000      
Tax withholdings related to equity awards (2,349,000) $ (13,000)   (2,336,000)  
Tax withholdings related to equity awards, Shares   (26,000)      
Taxes related to equity award vesting (1,055,000)     (1,055,000)  
Repurchases of common stock (8,086,000) $ (100,000)   (7,986,000)  
Repurchases of common stock, Shares   (200,000)      
Net loss (57,111,000)       (57,111,000)
Dividends paid (23,829,000)       (23,829,000)
Ending Balance at Dec. 31, 2014 870,272,000 $ 4,686,000   499,177,000 366,409,000
Ending Balance, Shares at Dec. 31, 2014   9,372,000      
Stock-based compensation 8,149,000 $ 94,000   8,055,000  
Stock-based compensation, Shares   188,000      
Tax withholdings related to equity awards (526,000) $ (8,000)   (518,000)  
Tax withholdings related to equity awards, Shares   (16,000)      
Taxes related to equity award vesting (2,044,000)     (2,044,000)  
Net loss (1,047,109,000)       (1,047,109,000)
Ending Balance at Dec. 31, 2015 (171,258,000) $ 4,772,000   504,670,000 (680,700,000)
Ending Balance, Shares at Dec. 31, 2015   9,544,000      
Stock-based compensation 4,660,000 $ 116,000   4,544,000  
Stock-based compensation, Shares   232,000      
Tax withholdings related to equity awards (313,000) $ (20,000)   (293,000)  
Tax withholdings related to equity awards, Shares   (41,000)      
Taxes related to equity award vesting 0        
Common stock issued for debt conversion 1,639,000 $ 88,000   1,551,000  
Common stock issued for debt conversion, Shares   176,000      
Common stock issued in exchange for debt 13,603,000 $ 1,385,000   12,218,000  
Common stock issued in exchange for debt, Shares   2,771,000      
Common stock warrants issued 15,623,000   $ 15,623,000    
Common stock warrants exercised $ 13,000 $ 628,000 (9,951,000) 9,336,000  
Common stock warrants exercised, Shares 1,255,462 1,256,000      
Stock issuance costs $ (102,000)     (102,000)  
Net loss (135,134,000)       (135,134,000)
Ending Balance at Dec. 31, 2016 $ (271,269,000) $ 6,969,000 $ 5,672,000 $ 531,924,000 $ (815,834,000)
Ending Balance, Shares at Dec. 31, 2016   13,938,000