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Government Programs (Details)
$ in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
May 31, 2017
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
AUD ($)
Dec. 31, 2020
AUD ($)
Government Programs                  
Research and development tax incentive receivable     $ 1,084            
SBIR Grant                  
Government Programs                  
Reduction of research and development expenses related to tax     500   $ 1,400   $ 700    
Research and development grants $ 1,500 $ 1,300              
Grants receivable     0   300        
Australian                  
Government Programs                  
Reduction of research and development expenses related to tax     1,000 $ 1.4 1,300 $ 1.9 $ 1,600 $ 2.1  
Overseas Findings | Australian                  
Government Programs                  
Research and development tax incentive receivable     $ 1,100   $ 0       $ 1.4