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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Beginning Balance at Dec. 31, 2017 $ 7,346   $ 232,034   $ (224,688)
Beginning Balance, shares at Dec. 31, 2017   404      
Cumulative effect of accounting change 230       230
Issuance costs for the sale of common stock (12)   (12)    
Issuance of common stock for release of awards (38)   (38)    
Issuance of common stock for release of awards, shares   5      
Stock-based compensation 93   93    
Net income (loss) 348       348
Ending Balance at Mar. 31, 2018 7,967   232,077   (224,110)
Ending Balance, shares at Mar. 31, 2018   409      
Beginning Balance at Dec. 31, 2017 7,346   232,034   (224,688)
Beginning Balance, shares at Dec. 31, 2017   404      
Net income (loss) (2,149)        
Ending Balance at Sep. 30, 2018 5,815   232,422   (226,607)
Ending Balance, shares at Sep. 30, 2018   414      
Beginning Balance at Mar. 31, 2018 7,967   232,077   (224,110)
Beginning Balance, shares at Mar. 31, 2018   409      
Stock-based compensation 159   159    
Net income (loss) 315       315
Ending Balance at Jun. 30, 2018 8,441   232,236   (223,795)
Ending Balance, shares at Jun. 30, 2018   409      
Issuance of common stock for release of awards (8)   (8)    
Issuance of common stock for release of awards, shares   5      
Stock-based compensation 194   194    
Net income (loss) (2,812)       (2,812)
Ending Balance at Sep. 30, 2018 5,815   232,422   (226,607)
Ending Balance, shares at Sep. 30, 2018   414      
Beginning Balance at Dec. 31, 2018 $ 7,157 $ 2 243,022   (235,867)
Beginning Balance, shares at Dec. 31, 2018 2,148 2,148      
Issuance of common stock for release of awards $ (1)   (1)    
Issuance of common stock for release of awards, shares   9      
Stock-based compensation (4)   (4)    
Net income (loss) 10       10
Ending Balance at Mar. 31, 2019 7,162 $ 2 243,017   (235,857)
Ending Balance, shares at Mar. 31, 2019   2,157      
Beginning Balance at Dec. 31, 2018 $ 7,157 $ 2 243,022   (235,867)
Beginning Balance, shares at Dec. 31, 2018 2,148 2,148      
Unrealized gain on available-for-sale investments $ 1        
Net income (loss) (1,894)        
Ending Balance at Sep. 30, 2019 $ 5,459 $ 2 243,217 $ 1 (237,761)
Ending Balance, shares at Sep. 30, 2019 2,178 2,178      
Beginning Balance at Mar. 31, 2019 $ 7,162 $ 2 243,017   (235,857)
Beginning Balance, shares at Mar. 31, 2019   2,157      
Issuance of common stock for release of awards, shares   5      
Stock-based compensation 119   119    
Unrealized gain on available-for-sale investments 1     1  
Net income (loss) (103)       (103)
Ending Balance at Jun. 30, 2019 7,179 $ 2 243,136 1 (235,960)
Ending Balance, shares at Jun. 30, 2019   2,162      
Issuance of common stock for release of awards (3)   (3)    
Issuance of common stock for release of awards, shares   16      
Stock-based compensation 84   84    
Net income (loss) (1,801)       (1,801)
Ending Balance at Sep. 30, 2019 $ 5,459 $ 2 $ 243,217 $ 1 $ (237,761)
Ending Balance, shares at Sep. 30, 2019 2,178 2,178