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CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Total
Balances, beginning of period at Dec. 31, 2017 $ 456,053 $ (426,968) $ (2) $ 29,083
Balances, beginning of period (in shares) at Dec. 31, 2017 99,412,007      
Shares issued (exercise of stock options) (Note 6) (in shares)       218,600
Net loss       $ (8,714)
Balances, end of period at Dec. 31, 2018 $ 456,938 (435,684)   21,254
Balances, end of period (in shares) at Dec. 31, 2018 100,268,161      
Adjusted balance | Accounting Standards Update 2016-01   (2) $ 2  
Adjusted balance $ 456,053 (426,970)   29,083
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (122)     (122)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 637,554      
Shares issued (exercise of stock options) (Note 6) $ 86     86
Shares issued (exercise of stock options) (Note 6) (in shares) 218,600      
Stock-based compensation (Note 6) $ 982     982
Option amendment (Note 6) (61)     (61)
Net loss   (8,714)   (8,714)
Balances, end of period at Dec. 31, 2018 $ 456,938 (435,684)   21,254
Balances, end of period (in shares) at Dec. 31, 2018 100,268,161      
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (76)     (76)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 266,296      
Shares issued (exercise of stock options) (Note 6) $ 89     $ 89
Shares issued (exercise of stock options) (Note 6) (in shares) 163,667     163,667
Stock-based compensation (Note 6) $ 765     $ 765
Net loss   (9,386)   (9,386)
Balances, end of period at Dec. 31, 2019 $ 457,716 $ (445,070)   $ 12,646
Balances, end of period (in shares) at Dec. 31, 2019 100,698,124