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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2018 $ 93,271 $ 37 $ 444,212 $ (350,945) $ (33)
Beginning balance, shares at Dec. 31, 2018   37,287,221      
Issuance of common stock upon exercise of stock options and employee stock purchase plan 95   95    
Issuance of common stock upon exercise of stock options and employee stock purchase plan, shares   31,391      
Issuance of restricted stock units, shares   4,467      
Stock-based compensation expense 2,076   2,076    
Unrealized gain (loss) on marketable debt securities 34       34
Net loss (13,112)     (13,112)  
Ending balance at Mar. 31, 2019 82,364 $ 37 446,383 (364,057) 1
Ending balance, shares at Mar. 31, 2019   37,323,079      
Beginning balance at Dec. 31, 2019 53,624 $ 37 449,903 (396,351) 35
Beginning balance, shares at Dec. 31, 2019   37,446,498      
Issuance of common stock upon exercise of stock options and employee stock purchase plan 10   10    
Issuance of common stock upon exercise of stock options and employee stock purchase plan, shares   10,911      
Issuance of restricted stock units, shares   12,187      
Stock-based compensation expense 710   710    
Unrealized gain (loss) on marketable debt securities (4)       (4)
Net loss (3,598)     (3,598)  
Ending balance at Mar. 31, 2020 $ 50,742 $ 37 $ 450,623 $ (399,949) $ 31
Ending balance, shares at Mar. 31, 2020   37,469,596