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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
AOCI Attributable to Parent
Accumulated deficit
Balance (in shares) at Dec. 31, 2017   41,612,395      
Balance at the beginning of the period at Dec. 31, 2017 $ 156,437 $ 42 $ 966,534 $ 3,969 $ (814,108)
Increase (Decrease) in Stockholders' Equity          
Exercised (in shares)   77,312      
Exercise of options 1,136   1,136    
Restricted stock vesting and issuance (in shares)   119,691      
Restricted stock vesting and issuance 0        
Share-based compensation expense 7,748   7,748    
Net loss (19,263)       (19,263)
Comprehensive income 984     984  
Balance (in shares) at Mar. 31, 2018   41,809,398      
Balance at the end of the period at Mar. 31, 2018 150,308 $ 42 975,418 4,953 (830,105)
Increase (Decrease) in Stockholders' Equity          
Adjustment to accumulated deficit 3,266       3,266
Balance (in shares) at Dec. 31, 2018   50,606,147      
Balance at the beginning of the period at Dec. 31, 2018 350,727 $ 51 1,288,137 1,462 (938,923)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock related to equity offering (in shares)   7,563,725      
Issuance of common stock related to equity offering 224,441 $ 7 224,434    
Exercised (in shares)   80,826      
Exercise of options 1,281   1,281    
Restricted stock vesting and issuance (in shares)   168,092      
Restricted stock vesting and issuance 0        
Share-based compensation expense 9,263   9,263    
Net loss (72,113)       (72,113)
Comprehensive income (657)     (657)  
Balance (in shares) at Mar. 31, 2019   58,418,790      
Balance at the end of the period at Mar. 31, 2019 $ 512,942 $ 58 $ 1,523,115 $ 805 $ (1,011,036)