Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

v3.20.1
Income Taxes - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes Disclosure [Line Items]        
Provision for income taxes   $ 0 $ 0 $ 0
Research and development tax credit utilized against employer's portion of payroll tax $ 250,000      
Research and development tax credit utilized as reduction of payroll expenses   284,000 175,000  
Valuation allowance increased   7,600,000 $ 5,100,000 $ 400,000
Benefit for deferred tax assets   0    
Liability related to uncertain tax positions   0    
Interest charges or penalties related to unrecognized tax benefits   0    
Accrued interest and penalties related to gross unrecognized tax benefits   0    
Australian Taxation Office        
Income Taxes Disclosure [Line Items]        
Net operating loss (NOL) carryforwards   1,900,000    
Federal        
Income Taxes Disclosure [Line Items]        
Net operating loss (NOL) carryforwards   $ 72,700,000    
Net operating loss carryforwards expiration start year   2035    
Net operating loss (NOL) carryforwards indefinite   $ 50,600,000    
Federal | Research and Development        
Income Taxes Disclosure [Line Items]        
Tax credit carryforward expiration start year   2035    
Tax credit carryforward   $ 1,300,000    
State        
Income Taxes Disclosure [Line Items]        
Net operating loss (NOL) carryforwards   $ 17,300,000    
Net operating loss carryforwards expiration start year   2035    
State | Research and Development        
Income Taxes Disclosure [Line Items]        
Tax credit carryforward   $ 1,100,000