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Income Taxes - Additional Information (Details) - USD ($)
 9 Months Ended 12 Months Ended
Dec. 22, 2017
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Corporate tax rate   21.00% 21.00% 21.00% 21.00%  
Current income tax provision       $ 0 $ 0  
Deferred income tax provision       0 0  
Valuation allownace on net deferred tax assets       $ 46,998,000 $ 29,771,000  
Effective income tax rate   0.00% 0.00% 0.00% 0.00%  
Uncertain tax positions       $ 2,397,000 $ 1,473,000 $ 549,000
Tax Year 2015 [Member] | Minimum            
Tax year open for examination       2015    
Domestic Tax Authority [Member]            
Federal net operating loss carryforwards       $ 164,800,000    
Federal net operating loss carryforwards indefinitely       164,800,000    
Federal net operating loss carry forwards with limitation       164,800,000    
State net operating loss carry forwards with limitation       164,800,000    
Domestic Tax Authority [Member] | Indefinitely [Member]            
Federal net operating loss carryforwards       122,300,000    
Federal net operating loss carryforwards indefinitely       122,300,000    
Federal net operating loss carry forwards with limitation       122,300,000    
State net operating loss carry forwards with limitation       122,300,000    
Domestic Tax Authority [Member] | Year Of Expiry From Two Thousand Thirty Five To Two Thousand Thirty Six [Member]            
Federal net operating loss carryforwards       42,500,000    
Federal net operating loss carryforwards indefinitely       42,500,000    
Federal net operating loss carry forwards with limitation       42,500,000    
State net operating loss carry forwards with limitation       42,500,000    
Domestic Tax Authority [Member] | Year Of Expiry Two Thousand And Twenty Seven [Member]            
Federal research and development tax credit carryforwards       4,700,000    
State research and development tax credit carryforwards       4,700,000    
State and Local Jurisdiction [Member] | Year Of Expiry From Two Thousand Thirty Five [Member]            
Federal net operating loss carryforwards       177,900,000    
Federal net operating loss carryforwards indefinitely       177,900,000    
Federal net operating loss carry forwards with limitation       177,900,000    
State net operating loss carry forwards with limitation       177,900,000    
State and Local Jurisdiction [Member] | Year Of Expiry Two Thousand And Twenty Seven [Member]            
Federal research and development tax credit carryforwards         100,000  
State research and development tax credit carryforwards         100,000  
Gores Metropoulos Inc [Member]            
Corporate tax rate 21.00%          
Maximum percentage of taxable income in which NOLs limited to deduct 80.00%          
Current income tax provision       1,443,960    
Deferred income tax provision       (2,353)    
Valuation allownace on net deferred tax assets       $ 30,238 $ 5,635  
Effective income tax rate   21.00%        
Uncertain tax positions   $ 0        
Accrued interest related to uncertain tax positions   0        
Accrued penalties related to uncertain tax positions   $ 0