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Summary of Significant Accounting and Reporting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jun. 11, 2020
Dec. 31, 2018
Dec. 31, 2017
Concentration Risk [Line Items]          
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01    
Emerging growth company, threshold on annual gross revenue $ 1,070,000,000.00        
Emerging growth company, threshold on convertible debt issued 1,000,000,000        
Restricted cash 2,635,000 $ 2,222,000   $ 2,064,000  
Accounts receivable, allowance for credit loss 0 0      
Stockholders' equity attributable to parent $ 26,622,000 (234,779,000)   (133,792,000) $ (74,869,000)
Program fees          
Concentration Risk [Line Items]          
Revenue from contract with customer, installment basis 12 months        
Claims administration service fees          
Concentration Risk [Line Items]          
Revenue from contract with customer, monthly service fee, percentage 3.00%        
Minimum          
Concentration Risk [Line Items]          
Property, plant and equipment, useful life 3 years        
Maximum          
Concentration Risk [Line Items]          
Property, plant and equipment, useful life 8 years        
Accumulated Deficit          
Concentration Risk [Line Items]          
Stockholders' equity attributable to parent $ (428,406,000) $ (242,781,000)   (139,810,000) (78,358,000)
Cumulative Effect, Period of Adoption, Adjustment          
Concentration Risk [Line Items]          
Stockholders' equity attributable to parent       32,768,000 $ 0
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit          
Concentration Risk [Line Items]          
Stockholders' equity attributable to parent       32,768,000  
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit | Accounting Standards Update 2014-09          
Concentration Risk [Line Items]          
Stockholders' equity attributable to parent       $ 32,800,000  
Ten Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Program fees          
Concentration Risk [Line Items]          
Concentration risk, percentage 38.00%        
One Customer | Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Program fees          
Concentration Risk [Line Items]          
Concentration risk, percentage 13.00%        
One Customer | Accounts Receivable | Customer Concentration Risk          
Concentration Risk [Line Items]          
Concentration risk, percentage 19.00% 22.00%      
Two Insurance Partners | Revenue from Contract with Customer Benchmark | Customer Concentration Risk          
Concentration Risk [Line Items]          
Concentration risk, percentage 55.00%        
Top Insurance Partner | Revenue from Contract with Customer Benchmark | Customer Concentration Risk          
Concentration Risk [Line Items]          
Concentration risk, percentage 70.00%