Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY

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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common shares
Additional paid-in capital
Accumulated other comprehensive loss
Accumulated deficit
Series A convertible preferred shares
Convertible preferred shares
Series B convertible preferred shares
Convertible preferred shares
Balance at beginning of period (shares) at Dec. 31, 2017   45,017       4,963 0
Balance at beginning of period at Dec. 31, 2017 $ 11,522 $ 45 $ 136,484 $ (4,695) $ (120,312) $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (15,072)       (15,072)    
Foreign currency translation adjustment 546     546      
Unrealized gains/(losses) on investments 1,096     1,096      
Stock based compensation expense 3,666   3,666        
Issuance of common stock resulting from exercise of stock options (shares)   595          
Issuance of common stock resulting from exercise of stock options 983 $ 1 982        
Issuance of common stock resulting from exercise of warrants (shares)   157          
Issuance of common stock resulting from exercise of warrants 313   313        
Issuance of common stock, net of offering costs (shares)   6,325          
Issuance of common stock, net of offering costs 47,207 $ 6 47,201        
Preferred stock conversion (shares)   2,056       (2,056)  
Preferred stock conversion 0 $ 2 (2)        
Balance at end of period (shares) at Sep. 30, 2018   54,150       2,907 0
Balance at end of period at Sep. 30, 2018 50,261 $ 54 188,644 (3,053) (135,384) $ 0 $ 0
Balance at beginning of period (shares) at Jun. 30, 2018   54,008       2,907 0
Balance at beginning of period at Jun. 30, 2018 55,315 $ 54 187,066 (2,574) (129,231) $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (6,153)       (6,153)    
Foreign currency translation adjustment 27     27      
Unrealized gains/(losses) on investments (506)     (506)      
Stock based compensation expense 1,302   1,302        
Issuance of common stock resulting from exercise of stock options (shares)   76          
Issuance of common stock resulting from exercise of stock options 144 $ 0 144        
Issuance of common stock resulting from exercise of warrants (shares)   66          
Issuance of common stock resulting from exercise of warrants 132   132        
Balance at end of period (shares) at Sep. 30, 2018   54,150       2,907 0
Balance at end of period at Sep. 30, 2018 50,261 $ 54 188,644 (3,053) (135,384) $ 0 $ 0
Balance at beginning of period (shares) at Dec. 31, 2018   54,151       2,907 0
Balance at beginning of period at Dec. 31, 2018 39,935 $ 54 189,929 (2,982) (147,066) $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (24,698)       (24,698)    
Foreign currency translation adjustment 1,908     1,908      
Unrealized gains/(losses) on investments 377     377      
Stock based compensation expense 4,260   4,260        
Issuance of common stock resulting from exercise of stock options (shares)   111          
Issuance of common stock resulting from exercise of stock options 218 $ 0 218        
Issuance of common stock from employee stock purchase plan (in shares)   58          
Issuance of common stock from employee stock purchase plan 178   178        
Issuance of common stock resulting from exercise of warrants (shares)   73          
Issuance of common stock resulting from exercise of warrants 105   105        
Preferred stock conversion (shares)   (5,000)         5,000
Preferred stock conversion 0 $ (5) 5        
Balance at end of period (shares) at Sep. 30, 2019   49,393       2,907 5,000
Balance at end of period at Sep. 30, 2019 20,642 $ 49 194,695 (697) (173,405) $ 0 $ 0
Balance at beginning of period (shares) at Jun. 30, 2019   49,262       2,907 5,000
Balance at beginning of period at Jun. 30, 2019 19,485 $ 49 192,956 (2,707) (170,813) $ 0 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (2,592)       (2,592)    
Foreign currency translation adjustment 1,636     1,636      
Unrealized gains/(losses) on investments 374     374      
Stock based compensation expense 1,518   1,518        
Issuance of common stock resulting from exercise of stock options (shares)   61          
Issuance of common stock resulting from exercise of stock options 121 $ 0 121        
Issuance of common stock resulting from exercise of warrants (shares)   70          
Issuance of common stock resulting from exercise of warrants 100   100        
Balance at end of period (shares) at Sep. 30, 2019   49,393       2,907 5,000
Balance at end of period at Sep. 30, 2019 $ 20,642 $ 49 $ 194,695 $ (697) $ (173,405) $ 0 $ 0