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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Total
Balances at Dec. 31, 2016   $ 9 $ 592,663 $ (479,984) $ 112,688
Balances (in shares) at Dec. 31, 2016   92,991      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       535,686 535,686
Sale of preferred stock     352,048   352,048
Sale of preferred stock (in shares) 6        
Preferred beneficial conversion feature     48,007   48,007
Conversion of preferred stock   $ 6 (6)    
Conversion of preferred stock (in shares) (6) 55,180      
Offering costs     (11,919)   (11,919)
Long-term incentive plan grants (in shares)   2,022      
Long-term incentive plan forfeitures (in shares)   (498)      
Reduction in shares to cover individuals' tax withholding     (1,995)   (1,995)
Reduction in shares to cover individuals' tax withholding (in shares)   (316)      
Stock-based compensation     37,483   37,483
Balances at Dec. 31, 2017   $ 15 1,016,281 55,702 1,071,998
Balances (in shares) at Dec. 31, 2017   149,379      
Increase (Decrease) in Stockholders' Equity          
Net income (loss)       (18,872) (18,872)
Common stock issuance   $ 1 63,479   63,480
Common stock issuance (in shares)   9,200      
Offering costs     (3,044)   (3,044)
Stock option exercises     323   323
Stock option exercises (in shares)   42      
Long-term incentive plan grants (in shares)   2,242      
Long-term incentive plan forfeitures (in shares)   (210)      
Reduction in shares to cover individuals' tax withholding     (262)   (262)
Reduction in shares to cover individuals' tax withholding (in shares)   (53)      
Stock-based compensation     9,260   9,260
Balances at Jun. 30, 2018   $ 16 $ 1,086,037 $ 36,830 $ 1,122,883
Balances (in shares) at Jun. 30, 2018   160,600