Commitments and Contingencies - Additional Information (Detail)		1 Months Ended				3 Months Ended		6 Months Ended
	Nov. 08, 2021 USD ($)	Jun. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)	Nov. 30, 2021 USD ($)	May 31, 2017 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) Vehicle	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jul. 01, 2013 USD ($)
Commitments And Contingencies [Line Items]
Accrued expenses and other current liabilities										$ 1,100,000
Milestone liabilities		$ 4,524,000				$ 4,524,000		$ 4,524,000		4,838,000
Operating lease costs						341,000	$ 340,000	629,000	$ 685,000
Financing liability		103,900,000				103,900,000		103,900,000		100,500,000
Financing liability, long term		94,447,000		$ 94,400,000		94,447,000		94,447,000		93,525,000
Financing liability, short term		$ 9,470,000		9,500,000		$ 9,470,000		$ 9,470,000		$ 6,977,000
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				Other assets		Other assets
Description of right to extension of lease term								The Company will receive a six-month concession at the start of the lease extension period on July 31, 2023. The Company has no further right to extend the lease term beyond the Extension Period.
Equipment | V-Go
Commitments And Contingencies [Line Items]
Embedded lease cost per month		$ 14,370
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				$ 1,400,000		1,400,000
Operating lease, liability		1,400,000				1,400,000		1,400,000
Marlborough Lease | Buildings
Commitments And Contingencies [Line Items]
Operating lease rent expenses		$ 28,895
Percentage of annual increase in lease payment		3.00%
1 Casper, LLC
Commitments And Contingencies [Line Items]
Sale price	$ 102,300,000			$ 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		65,000,000.0			$ 65,000,000.0
Accrued expenses and other current liabilities		5,000,000.0				5,000,000.0		5,000,000.0
Milestone liabilities		3,900,000				3,900,000		3,900,000
Deerfield Management Company Lp | Milestone Rights Liability | Accrued Expenses And Other Current Liabilities
Commitments And Contingencies [Line Items]
Accrued expenses and other current liabilities		$ 2,000,000.0				$ 2,000,000.0		$ 2,000,000.0
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			$ 79,543		$ 40,951
Percentage of annual increase in lease payment			3.00%		3.00%