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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 $ 8 $ 232,026   $ (224,688)
Beginning Balance, shares at Dec. 31, 2017   8,068      
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   103      
Stock-based compensation 93   93    
Net income (loss) 348       348
Ending Balance at Mar. 31, 2018 7,967 $ 8 232,069   (224,110)
Ending Balance, shares at Mar. 31, 2018   8,171      
Beginning Balance at Dec. 31, 2017 7,346 $ 8 232,026   (224,688)
Beginning Balance, shares at Dec. 31, 2017   8,068      
Net income (loss) 663        
Ending Balance at Jun. 30, 2018 8,441 $ 8 232,228   (223,795)
Ending Balance, shares at Jun. 30, 2018   8,171      
Beginning Balance at Mar. 31, 2018 7,967 $ 8 232,069   (224,110)
Beginning Balance, shares at Mar. 31, 2018   8,171      
Stock-based compensation 159   159    
Net income (loss) 315       315
Ending Balance at Jun. 30, 2018 8,441 $ 8 232,228   (223,795)
Ending Balance, shares at Jun. 30, 2018   8,171      
Beginning Balance at Dec. 31, 2018 $ 7,157 $ 43 242,981   (235,867)
Beginning Balance, shares at Dec. 31, 2018 42,967 42,967      
Issuance of common stock for release of awards $ (1)   (1)    
Issuance of common stock for release of awards, shares   172      
Stock-based compensation (4)   (4)    
Net income (loss) 10       10
Ending Balance at Mar. 31, 2019 7,162 $ 43 242,976   (235,857)
Ending Balance, shares at Mar. 31, 2019   43,139      
Beginning Balance at Dec. 31, 2018 $ 7,157 $ 43 242,981   (235,867)
Beginning Balance, shares at Dec. 31, 2018 42,967 42,967      
Unrealized gain on available-for-sale investments $ 1        
Net income (loss) (93)        
Ending Balance at Jun. 30, 2019 $ 7,179 $ 43 243,095 $ 1 (235,960)
Ending Balance, shares at Jun. 30, 2019 43,233 43,233      
Beginning Balance at Mar. 31, 2019 $ 7,162 $ 43 242,976   (235,857)
Beginning Balance, shares at Mar. 31, 2019   43,139      
Issuance of common stock for release of awards, shares   94      
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 $ 43 $ 243,095 $ 1 $ (235,960)
Ending Balance, shares at Jun. 30, 2019 43,233 43,233