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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings (Deficit)
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2017   223,289        
Balance at beginning of period at Dec. 31, 2017 $ 1,115,901 $ 2,814 $ 1,050,873 $ 106,923 $ (30,972) $ (13,737)
Increase (Decrease) in Stockholders' Equity            
Net loss (42,073)     (42,073)    
Foreign currency translation adjustments 87       87  
Change in marketable securities/ reclassification of marketable securities (85)       (85)  
Equity-based compensation expense 2,280   2,280      
Common shares issued upon vesting of share-based awards (in shares)   601        
Common shares issued upon vesting of share-based awards 0 $ 8 (8)      
Common shares issued for employee stock purchase plan (in shares)   99        
Common shares issued for employee stock purchase plan 561 $ 1 560      
Treasury shares withheld (in shares)   (167)        
Treasury shares withheld (1,035)         (1,035)
Balance at end of period (in shares) at Mar. 31, 2018   223,822        
Balance at end of period at Mar. 31, 2018 1,076,306 $ 2,823 1,053,705 65,520 (30,970) (14,772)
Balance at beginning of period (in shares) at Dec. 31, 2017   223,289        
Balance at beginning of period at Dec. 31, 2017 1,115,901 $ 2,814 1,050,873 106,923 (30,972) (13,737)
Increase (Decrease) in Stockholders' Equity            
Net loss (74,835)          
Foreign currency translation adjustments (653)          
Change in marketable securities/ reclassification of marketable securities 110          
Balance at end of period (in shares) at Sep. 30, 2018   224,228        
Balance at end of period at Sep. 30, 2018 1,049,183 $ 2,828 1,060,350 32,758 (31,515) (15,238)
Balance at beginning of period (in shares) at Mar. 31, 2018   223,822        
Balance at beginning of period at Mar. 31, 2018 1,076,306 $ 2,823 1,053,705 65,520 (30,970) (14,772)
Increase (Decrease) in Stockholders' Equity            
Net loss (25,763)     (25,763)    
Foreign currency translation adjustments (835)       (835)  
Change in marketable securities/ reclassification of marketable securities 167       167  
Equity-based compensation expense 2,888   2,888      
Common shares issued upon vesting of share-based awards (in shares)   247        
Common shares issued upon vesting of share-based awards 0 $ 2 (2)      
Common shares issued for employee stock purchase plan 1   1      
Treasury shares withheld (in shares)   (31)        
Treasury shares withheld (182)         (182)
Balance at end of period (in shares) at Jun. 30, 2018   224,038        
Balance at end of period at Jun. 30, 2018 1,052,582 $ 2,825 1,056,592 39,757 (31,638) (14,954)
Increase (Decrease) in Stockholders' Equity            
Net loss (6,999)     (6,999)    
Foreign currency translation adjustments 95       95  
Change in marketable securities/ reclassification of marketable securities 28       28  
Equity-based compensation expense 3,008   3,008      
Common shares issued upon vesting of share-based awards (in shares)   90        
Common shares issued upon vesting of share-based awards 0 $ 1 (1)      
Common shares issued for employee stock purchase plan (in shares)   133        
Common shares issued for employee stock purchase plan 753 $ 2 751      
Treasury shares withheld (in shares)   (33)        
Treasury shares withheld (284)         (284)
Balance at end of period (in shares) at Sep. 30, 2018   224,228        
Balance at end of period at Sep. 30, 2018 1,049,183 $ 2,828 1,060,350 32,758 (31,515) (15,238)
Balance at beginning of period (in shares) at Dec. 31, 2018   224,290        
Balance at beginning of period at Dec. 31, 2018 1,034,772 $ 2,829 1,062,794 16,860 (32,338) (15,373)
Increase (Decrease) in Stockholders' Equity            
Net loss (28,287)     (28,287)    
Foreign currency translation adjustments 250       250  
Equity-based compensation expense 2,574   2,574      
Common shares issued upon vesting of share-based awards (in shares)   720        
Common shares issued upon vesting of share-based awards 0 $ 8 (8)      
Common shares issued for employee stock purchase plan (in shares)   154        
Common shares issued for employee stock purchase plan 692 $ 2 690      
Treasury shares withheld (in shares)   (220)        
Treasury shares withheld (1,452)         (1,452)
Balance at end of period (in shares) at Mar. 31, 2019   224,944        
Balance at end of period at Mar. 31, 2019 1,007,849 $ 2,839 1,066,050 (12,127) (32,088) (16,825)
Balance at beginning of period (in shares) at Dec. 31, 2018   224,290        
Balance at beginning of period at Dec. 31, 2018 1,034,772 $ 2,829 1,062,794 16,860 (32,338) (15,373)
Increase (Decrease) in Stockholders' Equity            
Net loss (67,236)          
Foreign currency translation adjustments 1,079          
Change in marketable securities/ reclassification of marketable securities 0          
Balance at end of period (in shares) at Sep. 30, 2019   225,503        
Balance at end of period at Sep. 30, 2019 976,034 $ 2,846 1,072,768 (52,712) (29,623) (17,245)
Balance at beginning of period (in shares) at Mar. 31, 2019   224,944        
Balance at beginning of period at Mar. 31, 2019 1,007,849 $ 2,839 1,066,050 (12,127) (32,088) (16,825)
Increase (Decrease) in Stockholders' Equity            
Net loss (15,160)     (15,160)    
Foreign currency translation adjustments 458       458  
Change in marketable securities/ reclassification of marketable securities 0     (1,636) 1,636  
Equity-based compensation expense 3,017   3,017      
Common shares issued upon vesting of share-based awards (in shares)   186        
Common shares issued upon vesting of share-based awards 0 $ 2 (2)      
Treasury shares withheld (in shares)   (15)        
Treasury shares withheld (88)         (88)
Balance at end of period (in shares) at Jun. 30, 2019   225,115        
Balance at end of period at Jun. 30, 2019 996,076 $ 2,841 1,069,065 (28,923) (29,994) (16,913)
Increase (Decrease) in Stockholders' Equity            
Net loss (23,789)     (23,789)    
Foreign currency translation adjustments 371       371  
Change in marketable securities/ reclassification of marketable securities 0          
Equity-based compensation expense 2,647   2,647      
Common shares issued upon vesting of share-based awards (in shares)   217        
Common shares issued upon vesting of share-based awards 0 $ 2 (2)      
Common shares issued for employee stock purchase plan (in shares)   236        
Common shares issued for employee stock purchase plan 1,061 $ 3 1,058      
Treasury shares withheld (in shares)   (65)        
Treasury shares withheld (332)         (332)
Balance at end of period (in shares) at Sep. 30, 2019   225,503        
Balance at end of period at Sep. 30, 2019 $ 976,034 $ 2,846 $ 1,072,768 $ (52,712) $ (29,623) $ (17,245)