Stockholders' Equity - Additional Information (Detail) - USD ($)					1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	May 09, 2024	Oct. 02, 2023	Sep. 26, 2023	Dec. 16, 2022	Oct. 31, 2023	Mar. 31, 2022	Jul. 31, 2021	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Jul. 19, 2024	Jun. 06, 2024	Jan. 24, 2024	Jan. 17, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from the sale of common stock, net of issuance costs										$ 148,955,000	$ 0
Proceeds from issuance or sale of equity		$ 129,000,000
Public offering price per pre-funded warrant		$ 19.99
Offering costs					$ 8,200,000
Number of Common Warrant Shares								8,168,565		8,168,565		13,071,883
Expected dividend yield								0.00%	0.00%	0.00%	0.00%
Weighted average grant date fair value per option granted (in dollars per share)										$ 37.84	$ 3.8
Number of shares available for issuance under the plan on the first day of each year								41,041,216		41,041,216		31,678,159
Convertible preferred stock, shares authorized								10,000,000		10,000,000		10,000,000
Tranche A [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale and issuance of warrants to purchase common stock			$ 15,000,000
Number of Common Warrant Shares				8,598,870
Warrants and rights immediately exercisable term				30 days
Weighted Average Exercise Price per Share				$ 1.75
Exercisable warrants maximum aggregate exercise price				$ 15,000,000
Tranche B [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contingent receipt upon exerise of warrants and future performance of company										$ 12,300,000
Number of Common Warrant Shares				14,000,000
Proceeds from warrant exercise										$ 22,700,000
Warrants expire term prior to anniversary date of issuance				3 years 6 months
Warrants and rights exercisable term from following receipt of U.S. Food and drug administration approval				30 days
Weighted Average Exercise Price per Share				$ 2.50
Exercisable warrants maximum aggregate exercise price				$ 35,000,000
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Ownership interest of voting rights of all classes of stock (percent)								10.00%		10.00%
2020 Inducement Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant								5,318		5,318						500,000
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Income tax benefits recognized from stock-based compensation								$ 0	$ 0	$ 0	$ 0
Number of options granted								288,850	77,000	1,369,230	1,663,454
Future stock-based compensation for unvested employee options granted and outstanding								$ 50,100,000		$ 50,100,000
Future stock-based compensation, requisite service period										2 years 8 months 12 days
Stock Options [Member] | 2014 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant								609,179		609,179					2,000,000		1,000,000
Stock Options [Member] | 2014 Equity Incentive Plan [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of fair market value										110.00%
Stock Options [Member] | 2014 Equity Incentive Plan [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contractual term of option										10 years
ISOs [Member] | 2014 Equity Incentive Plan [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Contractual term of option										5 years
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation expense								$ 34,500,000		$ 34,500,000
Stock units granted								366,625	0	758,155	414,710
Fair value of restricted stock units vested										$ 44,670,000	$ 23,000
Weighted average grant-date fair value of all restricted stock units granted										$ 46.47	$ 5.25
Weighted average remaining vesting period										4 months 24 days
Restricted stock units vested										74,250
Restricted Stock Units [Member] | 2014 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock units granted										2,007,530
Weighted average grant-date fair value of all restricted stock units granted										$ 46.47
Restricted stock units vested										950,534
Performance-Based Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock units granted								1,239,375	0	1,249,375
March 2022 Common Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Common Warrant Shares								1,273,077		1,273,077		1,929,066
Weighted Average Exercise Price per Share								$ 4.5		$ 4.5		$ 4.5
Expiration period										2027-03
Controlled Equity Offering Sales Agreement [Member] | Cantor [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock (shares)												1,877,170
Proceeds from the sale of common stock, net of issuance costs							$ 7,400,000
Common stock, maximum aggregate purchase price							$ 25,000,000
Securities Purchase Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Sale and issuance of warrants to purchase common stock										$ 10,000,000
Shares issued from sale of common stock		1,825,000
Shares issued from sale of pre-funded warrants		1,175,000
Proceeds from sale of common stock and pre-funded warrants		$ 60,000,000
Number of common stock purchased upon issuance of warrants				22,598,870
Proceeds from warrant exercise										37,700,000
Weighted Average Exercise Price per Share				$ 0.4425
Exercisable warrants maximum aggregate exercise price								$ 12,300,000		12,300,000
Sales Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of aggregate gross proceeds to pay commission														3.00%
Jefferies LLC [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregrate Offering Price														$ 150,000,000
Underwritten Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock (shares)	3,450,000	3,450,000				2,666,667
Price per unit	$ 46.00	$ 20.00				$ 3.75
Underwriter discount and other offering expenses	$ 9,700,000
Number of common stock purchased upon issuance of warrants						1,333,333
Public offering price per pre-funded warrant						$ 3.60
Per share exercise price for pre-funded warrant						$ 0.15
Measurement term						5 years
Proceeds from offering after deducting underwriting discount and other estimated offering expenses	$ 158,700,000	$ 69,000,000				$ 13,800,000
Proceeds from warrant exercise										$ 0
Weighted Average Exercise Price per Share						$ 4.50
Warrants exercised										581,850
Underwritten Public Offering [Member] | March 2022 Common Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Common Warrant Shares								1,273,077		1,273,077
Proceeds from warrant exercise										$ 9,700,000
Warrants exercised										2,145,073
Underwritten Public Offering [Member] | March 2022 Pre-funded Warrants [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from warrant exercise										$ 0
Warrants exercised										1,333,333
Underwritten Public Offering [Member] | Securities Purchase Agreement [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceeds from the sale of common stock, net of issuance costs													$ 60,000,000
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant								1,864		1,864
Percentage of outstanding stock maximum										1.00%
Number of shares available for issuance under the plan on the first day of each year								3,729		3,729
Number of shares purchases by employees										0
Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Price per unit		$ 20.00