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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Atoll​ GmbH
Spectrum Inc.
Common Stock
Common Stock
Atoll​ GmbH
Common Stock
Spectrum Inc.
Additional Paid-in Capital
Additional Paid-in Capital
Atoll​ GmbH
Additional Paid-in Capital
Spectrum Inc.
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Atoll​ GmbH
Accumulated Other Comprehensive Income (Loss)
Spectrum Inc.
Accumulated Deficit
Accumulated Deficit
Atoll​ GmbH
Accumulated Deficit
Spectrum Inc.
Balance at Dec. 31, 2015 $ 122,748     $ 329     $ 202,527     $ (8,566)     $ (71,542)    
Balance (in shares) at Dec. 31, 2015       32,949,353                      
Net income 11,681                 11,681    
Exercise of stock options and vesting of restricted stock 1,841     $ 4     1,837            
Exercise of stock options and vesting of restricted stock (in shares)       321,218                      
Unrealized gain on investments 6             6        
Issuance of commons stock pursuant to the acquisition   $ 14,135     $ 5     $ 14,130          
Issuance of commons stock pursuant to the acquisition, (in shares)         538,700                    
Payment of contingent consideration in stock 875         875            
Payment of contingent consideration in stock (in shares)       34,803                      
Conversion option of convertible notes, net of issuance costs of $639 18,072         18,072            
Stock-based compensation expense 4,595         4,595            
Balance at Dec. 31, 2016 168,764     $ 338     242,036     (13,749)     (59,861)    
Balance (in shares) at Dec. 31, 2016       33,844,074                      
Translation adjustment (5,189)             (5,189)        
Net income 28,353                 28,353    
Exercise of stock options and vesting of restricted stock 2,351     $ 3     2,348            
Exercise of stock options and vesting of restricted stock (in shares)       330,185                      
Unrealized gain on investments 5             5        
Issuance of commons stock pursuant to the acquisition     $ 247,575     $ 62     $ 247,513        
Issuance of commons stock pursuant to the acquisition, (in shares)           6,153,995                  
Payment of contingent consideration in stock 1,063     $ 1     1,062            
Payment of contingent consideration in stock (in shares)       30,756                      
Proceeds from issuance of common stock, net of issuance costs of $8,691 129,309     $ 32     129,277            
Proceeds from issuance of common stock (in shares)       3,228,069                      
Stock-based compensation expense 6,747         6,747            
Balance at Dec. 31, 2017 591,548     $ 436     628,983     (6,363)     (31,508)    
Balance (in shares) at Dec. 31, 2017       43,587,079                      
Net income 12,178                            
Balance at Dec. 31, 2017 591,548     $ 436     628,983     (6,363)     (31,508)    
Balance (in shares) at Dec. 31, 2017       43,587,079                      
Translation adjustment 7,381             7,381        
Net income 16,617                 16,617    
Exercise of stock options and vesting of restricted stock 3,418     $ 3     3,415     0        
Exercise of stock options and vesting of restricted stock (in shares)       330,297                      
Stock-based compensation expense 10,192     $ 0     10,192     0        
Issuance of common stock for debt conversion                    
Issuance of common stock for debt conversion (in shares)       2                      
Balance at Dec. 31, 2018 615,568     $ 439     642,590     (11,893)     (15,568)    
Balance (in shares) at Dec. 31, 2018       43,917,378                      
Translation adjustment (5,530)             (5,530)        
Cumulative effect of accounting changes $ (677)                 $ (677)