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Commitments and Contingencies - Additional Information (Detail)	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) Customer	Jun. 30, 2024 USD ($)	Sep. 30, 2023 USD ($) Customer	Jun. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Insurer Customer	Sep. 30, 2023 USD ($) Customer	Dec. 31, 2023 USD ($) Insurer	Aug. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Commitments And Contingencies [Line Items]
Description of operating lease agreement for office space					The Company has a non-cancelable sublease agreement for its corporate headquarters in Boston, Massachusetts, which expires in January 2025 and a lease agreement for office space in Fort Worth, TX. which expires in December 2025. In August 2024, the Company entered into a new lease agreement for its new corporate headquarters and manufacturing facility in Burlington, Massachusetts, which the Company expects to begin occupying by the end of 2024, with a term of approximately 88 months following the rent commencement date. The Company has the option to extend the new lease for an additional five years, subject to certain conditions being satisfied. Under the new lease, the Company provided a security deposit to the landlord in the form of a letter of credit for $375,000. The Company has collateralized the letter of credit with cash in a separate bank account, which is accounted for as long-term restricted cash on the condensed consolidated balance sheet. Termination options are either not included, or have expired, for the Company’s other existing operating leases. Certain arrangements have discounted rent periods or escalating rent payment provisions. Leases with an initial term of twelve months or less are not recorded on the condensed consolidated balance sheets. We recognize rent expense on a straight-line basis over the lease term.
Operating Lease Right Of Use Assets	$ 467,000				$ 467,000
Finance program obligations	$ 275,390	$ 333,424	$ 222,326	$ 273,055	$ 275,390	$ 222,326	$ 142,217		$ 62,108	$ 52,307	$ 56,603
Loss Contingency							$ 55,000
Lease term								88 months
Option to extend lease term					The Company has the option to extend the new lease for an additional five years, subject to certain conditions being satisfied.
Letter of credit								$ 375,000
Directors and Officers Insurance Member
Commitments And Contingencies [Line Items]
Finance program obligations		39,000		29,000
Equal monthly payment made		$ 39,000		$ 27,000
Sales Revenue, Net [Member]
Commitments And Contingencies [Line Items]
Number of customers | Customer	0		0		0	0
Accounts Receivable [Member]
Commitments And Contingencies [Line Items]
Number of customers | Insurer					1		1
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One U.S. Insurance Payer [Member]
Commitments And Contingencies [Line Items]
Concentration Risk, Percentage	19.00%		36.00%		22.00%	40.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Patients with Medicare Advantage Insurance Plans [Member]
Commitments And Contingencies [Line Items]
Concentration Risk, Percentage	24.00%		59.00%		27.00%	59.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Patients With Medicare Part B Coverage [Member]
Commitments And Contingencies [Line Items]
Concentration Risk, Percentage	55.00%				44.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Insurer [Member]
Commitments And Contingencies [Line Items]
Concentration Risk, Percentage					25.00%		56.00%

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