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
Cumulative Effect, Period of Adoption, Adjustment
Preferred shares
Common shares
Additional paid-in capital
Accumulated other comprehensive loss
Accumulated deficit
Accumulated deficit
Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period (shares) at Dec. 31, 2018     3 54,151        
Balance at beginning of period at Dec. 31, 2018 $ 39,935 $ (1,641) $ 0 $ 54 $ 189,929 $ (2,982) $ (147,066) $ (1,641)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (22,106) [1]           (22,106)  
Foreign currency translation adjustment 272         272    
Unrealized gains/(losses) on investments 3         3    
Stock based compensation expense 2,742       2,742      
Issuance of common stock resulting from exercise of stock options 97       97      
Issuance of common stock resulting from exercise of stock options (in shares)       50        
Issuance of common stock resulting from purchase of employee stock purchase plan shares 178       178      
Issuance of common stock resulting from purchase of employee stock purchase plan shares (in shares)       58        
Issuance of common stock resulting from exercise of warrants 5       5      
Issuance of common stock resulting from exercise of warrants (in shares)       3        
Preferred stock conversion (shares)     5 (5,000)        
Preferred stock conversion (Series D)       $ (5) 5      
Balance at end of period (shares) at Jun. 30, 2019     8 49,262        
Balance at end of period at Jun. 30, 2019 19,485   $ 0 $ 49 192,956 (2,707) (170,813)  
Balance at beginning of period (shares) at Mar. 31, 2019     8 49,151        
Balance at beginning of period at Mar. 31, 2019 30,162   $ 0 $ 49 191,224 (2,056) (159,055)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (11,758)           (11,758)  
Foreign currency translation adjustment (414)         (414)    
Unrealized gains/(losses) on investments (237)         (237)    
Stock based compensation expense 1,452       1,452      
Issuance of common stock resulting from exercise of stock options 97       97      
Issuance of common stock resulting from exercise of stock options (in shares)       50        
Issuance of common stock resulting from purchase of employee stock purchase plan shares 178       178      
Issuance of common stock resulting from purchase of employee stock purchase plan shares (in shares)       58        
Issuance of common stock resulting from exercise of warrants 5       5      
Issuance of common stock resulting from exercise of warrants (in shares)       3        
Balance at end of period (shares) at Jun. 30, 2019     8 49,262        
Balance at end of period at Jun. 30, 2019 19,485   $ 0 $ 49 192,956 (2,707) (170,813)  
Balance at beginning of period (shares) at Dec. 31, 2019     11 55,212        
Balance at beginning of period at Dec. 31, 2019 51,352   $ 0 $ 55 227,468 (1,995) (174,176)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (8,547)           (8,547)  
Foreign currency translation adjustment 830         830    
Unrealized gains/(losses) on investments 101         101    
Stock based compensation expense 2,520       2,520      
Issuance of common stock resulting from exercise of stock options 271       271      
Issuance of common stock resulting from exercise of stock options (in shares)       139        
Issuance of common stock resulting from purchase of employee stock purchase plan shares 145       145      
Issuance of common stock resulting from purchase of employee stock purchase plan shares (in shares)       47        
Preferred stock conversion (shares)     3 (3,000)        
Preferred stock conversion (Series D)       $ (3) 3      
Balance at end of period (shares) at Jun. 30, 2020     14 52,399        
Balance at end of period at Jun. 30, 2020 46,672   $ 0 $ 52 230,407 (1,064) (182,723)  
Balance at beginning of period (shares) at Mar. 31, 2020     11 55,212        
Balance at beginning of period at Mar. 31, 2020 49,806   $ 0 $ 55 228,751 (1,227) (177,773)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (4,950)           (4,950)  
Foreign currency translation adjustment 178         178    
Unrealized gains/(losses) on investments (15)         (15)    
Stock based compensation expense 1,237       1,237      
Issuance of common stock resulting from exercise of stock options 271       271      
Issuance of common stock resulting from exercise of stock options (in shares)       139        
Issuance of common stock resulting from purchase of employee stock purchase plan shares 145       145      
Issuance of common stock resulting from purchase of employee stock purchase plan shares (in shares)       47        
Preferred stock conversion (shares)     3 (3,000)        
Preferred stock conversion (Series D)       $ (3) 3      
Balance at end of period (shares) at Jun. 30, 2020     14 52,399        
Balance at end of period at Jun. 30, 2020 $ 46,672   $ 0 $ 52 $ 230,407 $ (1,064) $ (182,723)  
[1] (1) Restated to conform to ASC 842. See accompanying Note 2.