XML 22 R6.htm IDEA: XBRL DOCUMENT v3.20.1
STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Gain (Loss)
Balances at Dec. 31, 2016 $ 122,380 $ 159 $ 1,080,198 $ (957,924) $ (53)
Balances (in shares) at Dec. 31, 2016   159,158,636      
Increase (Decrease) in Stockholders' Equity          
Net loss (27,916)     (27,916)  
Other comprehensive (loss) income (154)       (154)
Issuance of common stock in connection with at market offering, net of issuance costs 1,060 $ 1 1,059    
Issuance of common stock in connection with at market offering, net of issuance costs (in shares)   614,230      
Stock-based compensation related to issuance of common stock and options in exchange for services 200   200    
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares)   72,066      
Issuances of common stock under equity plans 51   51    
Issuances of common stock under equity plans (in shares)   32,307      
Stock-based compensation for equity- based awards to employees and directors 8,144   8,144    
401(k) contribution 32   32    
Balances at Dec. 31, 2017 103,797 $ 160 1,089,684 (985,840) (207)
Balances (in shares) at Dec. 31, 2017   159,877,239      
Increase (Decrease) in Stockholders' Equity          
Cumulative effect of accounting principle change 1,393     1,393  
Net loss (27,017)     (27,017)  
Other comprehensive (loss) income 24       24
Issuance of common stock in connection with at market offering, net of issuance costs 86,017 $ 23 85,994    
Issuance of common stock in connection with at market offering, net of issuance costs (in shares)   23,278,185      
Stock-based compensation related to issuance of common stock and options in exchange for services 191   191    
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares)   73,980      
Issuances of common stock under equity plans 6,951 $ 3 6,948    
Issuances of common stock under equity plans (in shares)   3,163,278      
Stock-based compensation for equity- based awards to employees and directors 6,368   6,368    
401(k) contribution 9   9    
Balances at Dec. 31, 2018 $ 177,733 $ 186 1,189,194 (1,011,464) (183)
Balances (in shares) at Dec. 31, 2018 186,392,682 186,392,682      
Increase (Decrease) in Stockholders' Equity          
Net loss $ (68,548)     (68,548)  
Other comprehensive (loss) income 315       315
Issuance of common stock in connection with at market offering, net of issuance costs 19,295 $ 14 19,281    
Issuance of common stock in connection with at market offering, net of issuance costs (in shares)   13,214,867      
Stock-based compensation related to issuance of common stock and options in exchange for services 68   68    
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares)   29,150      
Issuances of common stock under equity plans 204   204    
Issuances of common stock under equity plans (in shares)   177,882      
Stock-based compensation for equity- based awards to employees and directors 6,079   6,079    
401(k) contribution 9   9    
Balances at Dec. 31, 2019 $ 135,155 $ 200 $ 1,214,835 $ (1,080,012) $ 132
Balances (in shares) at Dec. 31, 2019 199,814,581 199,814,581