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CONDENSED 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, 2018 $ 177,733 $ 186 $ 1,189,194 $ (1,011,464) $ (183)
Balances (in shares) at Dec. 31, 2018   186,392,682      
Increase (Decrease) in Stockholders' Equity          
Net loss (10,059)     (10,059)  
Other comprehensive (loss) income 282       282
Stock-based compensation related to issuance of common stock and options in exchange for services 22   22    
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares)   13,365      
Stock-based compensation for equity- based awards to employees and directors 1,426   1,426    
401(k) contribution 9   9    
Balances at Mar. 31, 2019 169,413 $ 186 1,190,651 (1,021,523) 99
Balances (in shares) at Mar. 31, 2019   186,406,047      
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      
Increase (Decrease) in Stockholders' Equity          
Net loss (16,355)     (16,355)  
Other comprehensive (loss) income (256)       (256)
Issuance of common stock in connection with at market offering, net of issuance costs 686   686    
Issuance of common stock in connection with at market offering, net of issuance costs (in shares)   530,228      
Stock-based compensation related to issuance of common stock and options in exchange for services 16   16    
Stock-based compensation related to issuance of common stock and options in exchange for services (in shares)   6,039      
Stock-based compensation for equity- based awards to employees and directors 1,568   1,568    
Balances at Mar. 31, 2020 $ 120,814 $ 200 $ 1,217,105 $ (1,096,367) $ (124)
Balances (in shares) at Mar. 31, 2020   200,350,848