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Statement of Changes in Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Beginning balance at Dec. 31, 2018 $ 71,042 $ 177 $ 291,908 $ (221,043)
Beginning balance, shares at Dec. 31, 2018   17,744    
Share-based awards and options exercises 1,407 $ 5 1,402  
Share-based awards and options exercises, shares   483    
Share-based compensation expense 501   501  
Net loss (7,529)     (7,529)
Ending balance at Mar. 31, 2019 65,421 $ 182 293,811 (228,572)
Ending balance, shares at Mar. 31, 2019   18,227    
Beginning balance at Dec. 31, 2018 71,042 $ 177 291,908 (221,043)
Beginning balance, shares at Dec. 31, 2018   17,744    
Net loss (14,623)      
Ending balance at Jun. 30, 2019 59,819 $ 184 295,301 (235,666)
Ending balance, shares at Jun. 30, 2019   18,445    
Beginning balance at Mar. 31, 2019 65,421 $ 182 293,811 (228,572)
Beginning balance, shares at Mar. 31, 2019   18,227    
Share-based awards and options exercises 470 $ 2 468  
Share-based awards and options exercises, shares   218    
Share-based compensation expense 1,022   1,022  
Net loss (7,094)     (7,094)
Ending balance at Jun. 30, 2019 59,819 $ 184 295,301 (235,666)
Ending balance, shares at Jun. 30, 2019   18,445    
Beginning balance at Dec. 31, 2019 47,852 $ 186 297,753 (250,087)
Beginning balance, shares at Dec. 31, 2019   18,645    
Share-based awards and options exercises 76 $ 1 75  
Share-based awards and options exercises, shares   81    
Share-based compensation expense 1,196   1,196  
Net loss (12,613)     (12,613)
Ending balance at Mar. 31, 2020 36,511 $ 187 299,024 (262,700)
Ending balance, shares at Mar. 31, 2020   18,726    
Beginning balance at Dec. 31, 2019 47,852 $ 186 297,753 (250,087)
Beginning balance, shares at Dec. 31, 2019   18,645    
Net loss (20,378)      
Ending balance at Jun. 30, 2020 29,440 $ 188 299,717 (270,465)
Ending balance, shares at Jun. 30, 2020   18,809    
Beginning balance at Mar. 31, 2020 36,511 $ 187 299,024 (262,700)
Beginning balance, shares at Mar. 31, 2020   18,726    
Share-based awards and options exercises 48 $ 1 47  
Share-based awards and options exercises, shares   83    
Share-based compensation expense 646   646  
Net loss (7,765)     (7,765)
Ending balance at Jun. 30, 2020 $ 29,440 $ 188 $ 299,717 $ (270,465)
Ending balance, shares at Jun. 30, 2020   18,809