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Summary of Significant Accounting Policies (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
revenue_source
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2021
USD ($)
Property, Plant and Equipment [Line Items]                        
Advertising expense                 $ 19,300,000      
Number of operating segments | segment                 1      
Impairment losses                 $ 0      
Number revenue sources | revenue_source                 2      
Total Revenues $ 9,638,000 $ 3,833,000 $ 212,236,000 $ 1,840,000 $ 982,000 $ 981,000 $ 982,000 $ 145,419,000 $ 227,547,000 $ 148,364,000 $ 0  
Convertible notes, net of issuance costs 179,367,000       0       179,367,000 0    
Accumulated deficit 838,817,000       695,266,000       838,817,000 695,266,000    
Additional paid-in capital (797,655,000)       $ (715,166,000)       (797,655,000) (715,166,000)    
Cumulative Effect, Period of Adoption, Adjustment | Subsequent Event                        
Property, Plant and Equipment [Line Items]                        
Convertible notes, net of issuance costs                       $ 92,000,000.0
Accumulated deficit                       1,500,000
Additional paid-in capital                       $ 93,500,000
Product                        
Property, Plant and Equipment [Line Items]                        
Total Revenues $ 8,167,000 $ 3,331,000 $ 609,000 $ 858,000         $ 12,965,000 $ 0 $ 0  
Property and equipment | Minimum                        
Property, Plant and Equipment [Line Items]                        
Estimated useful lives                 3 years      
Property and equipment | Maximum                        
Property, Plant and Equipment [Line Items]                        
Estimated useful lives                 10 years