Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 16, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Feb. 17, 2023	Jan. 01, 2023	Aug. 26, 2022	Jul. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value per option granted (in dollars per share)			$ 1.88	$ 3.75
Number of shares available for issuance under the plan on the first day of each year			8,168,788		8,159,382
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]
Warrants outstanding (in shares)	8,598,870
Warrants and rights immediately exercisable term	30 days
Warrants expire term prior to anniversary date of issuance	3 years 6 months
Exercise price of warrants (in dollars per share)	$ 1.75
Exercisable warrants maximum aggregate exercise price	$ 15,000,000.0
Tranche B [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants outstanding (in shares)	14,000,000
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
Exercise price of warrants (in dollars per share)	$ 2.50
Exercisable warrants maximum aggregate exercise price	$ 35,000,000.0
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%
2020 Inducement Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant			585,668			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
Number of options granted			240,000	108,517
Future stock-based compensation for unvested employee options granted and outstanding			$ 3,200,000
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]
Vesting period			4 years
Number of shares available for grant			15,508				238,329
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]
Vesting period			4 years
Unrecognized stock based compensation expense			$ 400,000
Stock units granted			0	8,965
Vesting percentage			100.00%
Fair value of restricted stock units vested			$ 23,000,000	$ 100,000
Weighted average grant-date fair value of all restricted stock units granted			$ 0	$ 5.40
Weighted average remaining vesting period			9 months 18 days
Restricted Stock Units [Member] | 2014 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant-date fair value of all restricted stock units granted			$ 0.00
Warrants to Purchase Stock [Member] | 2010 and 2012 Convertible Promissory Notes [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants outstanding (in shares)			6,804
Exercise price of warrants (in dollars per share)			$ 365.25
Warrants term			10 years
Warrants expiration period			2024-11
Underwriter [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants outstanding (in shares)			1,100
Exercise price of warrants (in dollars per share)			$ 535.50
Warrants term			10 years
Warrants expiration period			2024-11
Controlled Equity Offering Sales Agreement [Member] | Cantor [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock (shares)			104,773
Common stock, maximum aggregate purchase price									$ 25,000,000.0
Net proceeds from sale of common stock			$ 300,000
Securities Purchase Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock purchased upon issuance of warrants	22,598,870
Exercise price of warrants (in dollars per share)	$ 0.4425
Underwritten Public Offering [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Issuance of common stock (shares)		2,666,667
Price per unit		$ 3.75		$ 3.75
Number of common stock purchased upon issuance of warrants		1,333,333		1,333,333
Public offering price per pre-funded warrant		$ 3.60		$ 3.60
Per share exercise price for pre-funded warrant		$ 0.15		$ 0.15
Measurement term		5 years		5 years
Proceeds from offering after deducting underwriting discount and other estimated offering expenses		$ 13,800,000
Exercise price of warrants (in dollars per share)		$ 4.50		$ 4.50
Underwritten Public Offering [Member] | Securities Purchase Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Net proceeds from sale of common stock					$ 60,000,000.0
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant			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
Number of shares purchases by employees			0