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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Feb. 29, 2020	Mar. 31, 2020	Mar. 31, 2019
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non-option		$ 0.5
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years	4 years
Aggregate number of shares granted to awards, share-based compensation arrangements		78,500	294,900
Weighted average exercise price of the stock options granted		$ 1.25	$ 1.49
Weighted average grant date fair value of the stock options granted		$ 0.93	$ 1.06
Risk-free interest rate		0.79%
Expected life		5 years 8 months 1 day
Volatility rate		93.83%
Dividend yield		0.00%
Fair value of stock granted, share-based compensation arrangements			$ 0.3
Options and Performance-based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to options		$ 8.0
Employees \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted		230,000
Restricted stock units weighted average grant date fair value		$ 1.25	$ 1.49
Vesting period		4 years
Number of restricted stock units issued			754,729
Vesting rights percentage	100.00%
Non-employee Directors \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted		42,067
Restricted stock units weighted average grant date fair value		$ 1.17