Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY

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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
2019 Convertible Senior Notes
2023 Convertible Senior Notes
Common Stock
Additional paid-in capital
Additional paid-in capital
2019 Convertible Senior Notes
Additional paid-in capital
2023 Convertible Senior Notes
Accumulated other comprehensive income (loss)
Accumulated deficit
Balance at beginning of period (shares) at Dec. 31, 2015       19,949,012          
Balance at beginning of period at Dec. 31, 2015 $ 237,282     $ 20 $ 661,850     $ 4,903 $ (429,491)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock under employee stock compensation plans, net (shares)       210,626          
Issuance of common stock under employee stock compensation plans, net 5,416       5,416        
Shares issued in OMT acquisition (shares)       790,163          
Shares issued in OMT acquisition 77,331     $ 1 77,330        
Reclassification of equity component of currently redeemable convertible notes 10,065       10,065        
Stock-based compensation $ 18,893       18,893        
Repurchase of common stock (shares) (40,500)     (40,500)          
Repurchase of common stock $ (3,901)       (3,901)        
Other comprehensive income (loss) (2,160)             (2,160)  
Net income (loss) (1,636)               (1,636)
Balance at end of period (shares) at Dec. 31, 2016       20,909,301          
Balance at end of period at Dec. 31, 2016 341,290     $ 21 769,653     2,743 (431,127)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock under employee stock compensation plans, net (shares)       253,364          
Issuance of common stock under employee stock compensation plans, net (5,558)       (5,558)        
Shares issued in OMT acquisition 0                
Reclassification of equity component of currently redeemable convertible notes 10,704       10,704        
Stock-based compensation $ 24,916       24,916        
Repurchase of common stock (shares) (14,000)     (14,000)          
Repurchase of common stock $ (1,966)       (1,966)        
Other comprehensive income (loss) (257)             (257)  
Net income (loss) 12,556               12,556
Balance at end of period (shares) at Dec. 31, 2017       21,148,665          
Balance at end of period at Dec. 31, 2017 399,788     $ 21 798,205     2,486 (400,924)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Issuance of common stock under employee stock compensation plans, net (shares)       399,116          
Issuance of common stock under employee stock compensation plans, net 16,417       16,417        
Shares issued in OMT acquisition 0                
Reclassification of equity component of currently redeemable convertible notes 18,859       18,859        
Stock-based compensation $ 20,846       20,846        
Repurchase of common stock (shares) (782,248)     (782,248)          
Repurchase of common stock $ (127,481)       (127,481)        
Other comprehensive income (loss) 73             73
Convertible bond hedge and warrant transactions, net of tax   $ (1,559) $ (1,807)     $ (1,559) $ (1,807)    
Loss on settlement of Notes   3,187       3,187      
Warrant repurchase   (30,472)       (30,472)      
Loss on repurchase of warrants   1,792       1,792      
Tax effect for Notes transactions   $ (1,680) (3,181)     $ (1,680) (3,181)    
Warrant derivative     $ 97,805       $ 97,805    
Foreign currency translation adjustment (921)             (921)  
Other tax reclassifications 346       183       163
Net income (loss) 143,321               143,321
Balance at end of period (shares) at Dec. 31, 2018       20,765,533          
Balance at end of period at Dec. 31, 2018 $ 560,914     $ 21 $ 791,114     $ (1,024) $ (229,197)