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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 01, 2022
USD ($)
Nov. 08, 2021
USD ($)
Nov. 30, 2017
USD ($)
May 31, 2017
USD ($)
Mar. 31, 2022
USD ($)
Vehicle
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Nov. 30, 2021
USD ($)
Jul. 01, 2013
USD ($)
Commitments And Contingencies [Line Items]                  
Accrued expenses and other current liabilities         $ 1,100,000   $ 1,100,000    
Milestone rights liability         4,800,000   4,800,000    
Operating lease costs         288,000 $ 350,000      
Financing liability         102,900,000   100,500,000    
Financing liability, long term         93,463,000   93,525,000 $ 93,500,000  
Financing liability, short term         $ 9,410,000   6,977,000 $ 9,400,000  
Payment of long term purchase commitment, amendment fees             $ 2,000,000.0    
Supply Agreement expiration period         Dec. 31, 2027        
Supply Agreement renewal period         2 years        
Operating Lease Right Of Use Asset Statement Of Financial Position Extensible List         Other assets        
Master Lease Agreement with Enterprise | Vehicle Leases                  
Commitments And Contingencies [Line Items]                  
Number of vehicle leases retired | Vehicle         85        
Number of vehicle leases replaced | Vehicle         85        
Number of vehicle leases | Vehicle         89        
Operating lease rent expenses         $ 100,000        
Gain or loss recorded for leases removed         500,000        
Operating lease, right-of-use asset         1,400,000        
Operating lease, liability         1,400,000        
1 Casper, LLC                  
Commitments And Contingencies [Line Items]                  
Sale price   $ 102,300,000              
Lease initial term   20 years              
Lease renewal option   4 years              
Lease renewal options   renewal options of five years              
Lessee,option to extend [true false]   true              
Operating lease costs   $ 9,500,000              
Lease, description   The total annual rent under the Lease starts at approximately $9.5 million per year, subject to a 50% rent abatement during the first year of the Lease, and will increase annually by (i) 2.5% in the second through fifth year of the Lease and (ii) 3% in the sixth and each subsequent year of the Lease, including any renewal term.              
Security deposit   $ 2,000,000.0              
Lease repurchase description   the Company has four options to repurchase the Property, in 2026, 2031, 2036 and 2041, for the greater of (i) $102.3 million and (ii) the fair market value of the Property.              
Minimum | 1 Casper, LLC                  
Commitments And Contingencies [Line Items]                  
Lease repurchase, amount   $ 102,300,000              
Deerfield Management Company Lp | Milestone Rights Liability                  
Commitments And Contingencies [Line Items]                  
Contingent liability remain payable         65,000,000.0       $ 65,000,000.0
Accrued expenses and other current liabilities         1,100,000        
Milestone rights liability         $ 4,800,000        
Deerfield Management Company Lp | Milestone Rights Liability | Maximum                  
Commitments And Contingencies [Line Items]                  
Contingent liability for milestone payments                 $ 90,000,000.0
Russell Ranch Road II LLC | Office Lease                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expenses     $ 35,969 $ 40,951          
Percentage of annual increase in lease payment     3.00% 3.00%          
Reimbursement amount received for tenant improvements     $ 56,325            
Russell Ranch Road II LLC | Office Lease | Subsequent Event                  
Commitments And Contingencies [Line Items]                  
Lease renewal option 66 months                
Operating lease rent expenses $ 79,543                
Percentage of annual increase in lease payment 3.00%