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Debt Obligations (Details)
$ / shares in Units, $ in Thousands
1 Months Ended
Nov. 30, 2014
USD ($)
Oct. 01, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Sep. 28, 2020
USD ($)
shares
Sep. 30, 2019
shares
Aug. 30, 2018
USD ($)
Dec. 18, 2017
USD ($)
Nov. 20, 2014
$ / shares
Debt Instrument [Line Items]                
Debt Issuance Costs, Gross             $ 4,100  
Proceeds from Convertible Debt $ 87,500              
Conv Debt Instrument Interest Rate Stated Percentage               5.25%
Debt Instrument, Convertible, Conversion Ratio 118.4553              
Debt Instrument, Convertible, Conversion Price | $ / shares               $ 8.442
Debt Issuance Cost $ 3,400              
Unamortized Debt Issuance Expense     $ 130          
Debt Instrument, Fair Value Disclosure     15,400          
Mortgage Debt Instrument_Revere_LXRX     $ 11,000     $ 12,900    
Mortgage Debt Interest Rate_Base_Revere_LXRX           5.50%    
Mortgage Debt Interest Rate BasePlus_Revere_LXRX           7.50%    
Mortgage Debt Balloon Payment_LXRX           $ 10,300    
Debt Instrument, Interest Rate, Stated Percentage     9.00%          
Debt Instrument, Face Amount             $ 150,000  
Common stock, shares issued | shares     117,231,000   106,679,000      
Convertible debt exchange     $ 8,400          
accrued interest on convertible       $ 1,100        
Convertible debt exchange Remaining Notes     $ 20,000          
Convertible debt exchange - Total Principal Amount       75,800        
Convertible debt exchange - September principal amount       (67,100)        
Convertible debt exchange- September cash portion       $ 44,000        
Convertible debt exchange - September share payment | shares       9,332,471        
Subsequent Event [Member]                
Debt Instrument [Line Items]                
accrued interest on convertible   $ 200            
Future Convertible debt exchange shares | shares   1,036,484            
future convertible debt exchange   $ 6,000            
principal amount of convertible notes   $ (8,800)