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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Balance at Dec. 31, 2016 $ 15,328   $ 229,348 $ (214,020)
Balance, shares at Dec. 31, 2016   332    
Issuance of common stock under stock plans, net (20)   (20)  
Issuance of common stock under stock plans, net, shares   6    
Issuance of common stock, net of issuance costs 1,987   1,987  
Issuance of common stock, net of issuance costs, shares   66    
Stock-based compensation 719   719  
Net loss (10,668)     (10,668)
Balance at Dec. 31, 2017 7,346   232,034 (224,688)
Balance, shares at Dec. 31, 2017   404    
Cumulative effect of accounting change 230     230
Issuance of common stock under stock plans, net (46)   (46)  
Issuance of common stock under stock plans, net, shares   14    
Issuance of common stock and warrants, net of issuance costs 10,362 $ 2 10,360  
Issuance of common stock and warrants, net of issuance costs (in shares)   1,730    
Stock-based compensation 674   674  
Net loss (11,409)     (11,409)
Balance at Dec. 31, 2018 $ 7,157 $ 2 243,022 (235,867)
Balance, shares at Dec. 31, 2018 2,148 2,148    
Issuance of common stock under stock plans, net $ (4)   (4)  
Issuance of common stock under stock plans, net, shares   31    
Stock-based compensation 263   263  
Net loss (2,580)     (2,580)
Balance at Dec. 31, 2019 $ 4,836 $ 2 $ 243,281 $ (238,447)
Balance, shares at Dec. 31, 2019 2,179 2,179