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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Accumulated deficit
Accumulated other comprehensive income (loss)
GENBAND
GENBAND
Common stock
GENBAND
Additional paid-in capital
Balance at Dec. 31, 2015 $ 223,026 $ 49 $ 1,240,803 $ (1,023,242) $ 5,416      
Balance (in shares) at Dec. 31, 2015   49,473,789            
Increase (Decrease) in Stockholders' Equity                
Issuance of common stock in connection with employee stock purchase plan 1,360   1,360          
Issuance of common stock in connection with employee stock purchase plan (in shares)   225,031            
Exercise of stock options 153   153          
Exercise of stock options (in shares)   23,070            
Vesting of restricted stock awards and units 0 $ 1 (1)          
Vesting of restricted stock awards and units (in shares)   792,773            
Vesting of performance-based stock awards 0              
Vesting of performance-based stock awards (in shares)   18,438            
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (1,810)   (1,810)          
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares)   (231,620)            
Repurchase of common stock (9,530) $ (1) (9,529)          
Repurchase of common stock (in shares)   (1,259,600)            
Stock-based compensation expense 19,768   19,768          
Other comprehensive income (loss) 87       87      
Net loss (13,932)     (13,932)        
Balance at Dec. 31, 2016 219,122 $ 49 1,250,744 (1,037,174) 5,503      
Balance (in shares) at Dec. 31, 2016   49,041,881            
Increase (Decrease) in Stockholders' Equity                
Issuance of common stock in connection with employee stock purchase plan 1,252   1,252          
Issuance of common stock in connection with employee stock purchase plan (in shares)   249,621            
Exercise of stock options 617   617          
Exercise of stock options (in shares)   105,688            
Vesting of restricted stock awards and units 0          
Vesting of restricted stock awards and units (in shares)   2,160,553            
Vesting of performance-based stock awards 0              
Vesting of performance-based stock awards (in shares)   145,357            
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (7,523)   (7,523)          
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares)   (807,952)            
Shares issued as consideration in connection with acquisition           $ 413,982 $ 5 $ 413,977
Shares issued as consideration in connection with acquisition (in shares)           50,857,708    
Stock-based compensation expense 25,657   25,657          
Reclassification between Common stock and Additional paid-in capital to record change in par value of common stock 0 $ (44) 44          
Other comprehensive income (loss) (2,434)       (2,434)      
Net loss (35,252)     (35,252)        
Balance at Dec. 31, 2017 $ 615,421 $ 10 1,684,768 (1,072,426) 3,069      
Balance (in shares) at Dec. 31, 2017 101,752,856 101,752,856            
Increase (Decrease) in Stockholders' Equity                
Exercise of stock options $ 73   73          
Exercise of stock options (in shares)   15,935            
Vesting of restricted stock awards and units 0              
Vesting of restricted stock awards and units (in shares)   1,278,062            
Vesting of performance-based stock awards 0              
Vesting of performance-based stock awards (in shares)   57,768            
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (2,024)   (2,024)          
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares)   (524,516)            
Shares issued as consideration in connection with acquisition           $ 30,000 $ 1 29,999
Shares issued as consideration in connection with acquisition (in shares)             4,235,531  
Assumption of equity awards in connection with acquisition of Edgewater Networks, Inc.           $ 747   $ 747
Stock-based compensation expense 10,013   10,013          
Other comprehensive income (loss) 634       634      
Net loss (76,810)     (76,810)        
Balance at Dec. 31, 2018 $ 590,298 $ 11 $ 1,723,576 $ (1,136,992) $ 3,703      
Balance (in shares) at Dec. 31, 2018 106,815,636 106,815,636