Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY

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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       5 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 (8,714)       (8,714)    
Foreign currency translation adjustment (581)     (581)      
Unrealized losses on investments (697)     (697)      
Stock based compensation expense 1,004   1,004        
Issuance of common stock resulting from exercise of stock options (shares)   513          
Issuance of common stock resulting from exercise of stock options 826 $ 1 825        
Issuance of common stock resulting from exercise of warrants (shares)   63          
Issuance of common stock resulting from exercise of warrants 126   126        
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)  
Preferred stock conversion 0 $ 2 (2)        
Balance at end of period (shares) at Mar. 31, 2018   53,974       3 0
Balance at end of period at Mar. 31, 2018 50,693 $ 54 185,638 (5,973) (129,026) $ 0 $ 0
Balance at beginning of period (shares) at Dec. 31, 2018   54,151       3 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 (10,348)       (10,348)    
Foreign currency translation adjustment 686     686      
Unrealized losses on investments 240     240      
Stock based compensation expense 1,290   1,290        
Preferred stock conversion (shares)   (5,000)         5
Preferred stock conversion 0 $ (5) 5        
Balance at end of period (shares) at Mar. 31, 2019   49,151       3 5
Balance at end of period at Mar. 31, 2019 $ 30,162 $ 49 $ 191,224 $ (2,056) $ (159,055) $ 0 $ 0