XML 48 R35.htm IDEA: XBRL DOCUMENT v3.20.4
Summary of Significant Accounting Policies - Warrants and Fair Value of Financial Instruments (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Mar. 05, 2020
Jan. 31, 2019
Warrants          
Warrant, equity component $ 3,448   $ 3,448    
Dividend attributable to down round feature of warrants   $ 303 359    
Assets:          
Cash equivalents   51,116 3,891    
Total assets   51,116 3,891    
Liabilities:          
Restricted stock liability   204 159    
Total liabilities   204 159    
2019 Public Offering          
Warrants          
Dividend attributable to down round feature of warrants     $ 359    
Exercise price of warrant     $ 1.75   $ 6.085
January 2020 Private Placement          
Warrants          
Dividend attributable to down round feature of warrants   $ 303      
Exercise price of warrant   $ 1.055   $ 2.11 $ 1.75
Level 1          
Assets:          
Cash equivalents   $ 51,116 $ 3,891    
Total assets   51,116 3,891    
Level 2          
Liabilities:          
Restricted stock liability   204 159    
Total liabilities   $ 204 $ 159