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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - 6 months ended Jun. 30, 2017 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid in Capital
Accumulated Deficit
Balance at Dec. 31, 2016 $ 309,620 $ 1,115 $ 527,868 $ (219,363)
Balance, shares at Dec. 31, 2016 111,564 111,564    
Vesting of restricted stock units   $ 7 (7)  
Vesting of restricted stock units, shares   684    
Stock compensation expense $ 6,379   6,379  
Exercise of stock options 2,958 $ 6 2,952  
Exercise of stock options, shares   537    
Repurchase of common stock (2,473) $ (2) (2,471)  
Repurchase of common stock, shares   (203)    
Cumulative effect adjustment (Note 1) 8,889     8,889
Net income 41,732     41,732
Balance at Jun. 30, 2017 $ 367,105 $ 1,126 $ 534,721 $ (168,742)
Balance, shares at Jun. 30, 2017 112,582 112,582