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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% |  |  |  |  |  |  |  |

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