Stock-Based Awards - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 30, 2018	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 1,865	$ 2,380
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		1,281	1,590
2018 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation cost		$ 16,181
Unrecognized stock-based compensation cost, weighted-average period (in years)		2 years 1 month 6 days
Chief Executive Officer | General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 28
Stock Option | Non-Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock converted under option plan (in shares)		240,570		276,570
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock units, Granted (in shares)		732,000
Restricted Stock Units (RSUs) | Vesting August 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period percentage		40.00%
Restricted Stock Units (RSUs) | Vesting August 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period percentage		60.00%
Restricted Stock Units (RSUs) | Granted to Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 209	$ 543
2014 Plan | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of exercise price per share of stock options to fair market value of share of common stock (as a percent)		100.00%
Stock options granted expiry period (in years)		10 years
Weighted average grant-date fair value per share of stock options granted (in dollars per share)		$ 2.49		$ 6.41
2018 Stock Option and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock to be issued (in shares)	1,545,454
Percentage of authorized number of shares of common stock outstanding (as a percent)	4.00%
Number of shares of common stock converted under option plan (in shares)		8,658,136		7,057,258
2018 Employee Stock Option and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future issuance (in shares)		329,138
2018 Employee Stock Option and Incentive Plan | 2018 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock to be issued (in shares)	256,818	1,502,734
Percentage of authorized number of shares of common stock outstanding (as a percent)	1.00%
Number of shares of common stock issued (in shares)		51,329	19,377
2014 Plan and 2018 Plan | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted expiry period (in years)		10 years
Stock options granted vesting period (in years)		4 years
Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock to be issued (in shares)				600,000
Number of shares of common stock converted under option plan (in shares)		98,000		0
Inducement Plan | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future issuance (in shares)		502,000
Weighted average grant-date fair value per share of stock options granted (in dollars per share)		$ 2.41