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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance (in shares) at Dec. 31, 2014   32,774,374      
Balance at Dec. 31, 2014 $ 111,732 $ 328 $ 198,064 $ (5,773) $ (80,887)
Net income 9,345       9,345
Unrealized gain on investments 22     22  
Foreign currency translation adjustment, net (2,815)     (2,815)  
Share-based compensation expense 3,598   3,598    
Exercise of stock options and vesting of restricted stock 866 $ 1 865    
Exercise of stock options and vesting of restricted stock (in shares)   174,979      
Balance (in shares) at Dec. 31, 2015   32,949,353      
Balance at Dec. 31, 2015 122,748 $ 329 202,527 (8,566) (71,542)
Net income 11,681       11,681
Unrealized gain on investments 6     6  
Shares issued in acquisition (in shares)   538,700      
Shares issued in acquisition 14,135 $ 5 14,130    
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 $639,000 18,072   18,072    
Foreign currency translation adjustment, net (5,189)     (5,189)  
Share-based compensation expense 4,595   4,595    
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      
Balance (in shares) at Dec. 31, 2016   33,844,074      
Balance at Dec. 31, 2016 168,764 $ 338 242,036 (13,749) (59,861)
Net income 28,353       28,353
Unrealized gain on investments 5     5  
Shares issued in acquisition (in shares)   6,153,995      
Shares issued in acquisition 247,575 $ 62 247,513    
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 129,309 $ 32 129,277    
Proceeds from issuance of common stock (in shares)   3,228,069      
Foreign currency translation adjustment, net 7,381     7,381  
Share-based compensation expense 6,747   6,747    
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      
Balance (in shares) at Dec. 31, 2017   43,587,079      
Balance at Dec. 31, 2017 $ 591,548 $ 436 $ 628,983 $ (6,363) $ (31,508)