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Stockholders' Equity - Restricted Stock Awards, Restricted Stock Units and Performance-Based Restricted Stock Units - Additional Information (Detail)		9 Months Ended
	Aug. 23, 2017 USD ($) Tranche shares	Dec. 31, 2018 Tranche shares	Aug. 15, 2018 shares	Mar. 31, 2018 shares	Apr. 24, 2017 shares
Restricted stock units (RSUs) [Member]
Class Of Stock [Line Items]
Number of shares allocated		2,266,128		2,035,345
Share based compensation arrangement, number of shares vested		595,163
Restricted stock units (RSUs) [Member] | CMO [Member]
Class Of Stock [Line Items]
Number of shares allocated			160,714
Inducement Award Performance-Based Restricted Stock Units [Member]
Class Of Stock [Line Items]
Number of tranches | Tranche	5
Award vesting percentage		100.00%
Number of tranches expected to vest | Tranche		0
Grant date fair values of tranches | $	$ 165,000
Inducement Award Performance-Based Restricted Stock Units [Member] | Maximum [Member]
Class Of Stock [Line Items]
Number of shares allocated	208,822
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche One [Member]
Class Of Stock [Line Items]
Award vesting percentage	20.00%
Stock units vesting year	2018
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche One [Member] | Minimum [Member]
Class Of Stock [Line Items]
Award vesting percentage	0.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche One [Member] | Maximum [Member]
Class Of Stock [Line Items]
Award vesting percentage	120.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Two [Member]
Class Of Stock [Line Items]
Award vesting percentage	20.00%
Stock units vesting year	2019
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Two [Member] | Minimum [Member]
Class Of Stock [Line Items]
Award vesting percentage	0.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Two [Member] | Maximum [Member]
Class Of Stock [Line Items]
Award vesting percentage	120.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Three [Member]
Class Of Stock [Line Items]
Award vesting percentage	20.00%
Stock units vesting year	2020
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Three [Member] | Minimum [Member]
Class Of Stock [Line Items]
Award vesting percentage	0.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Three [Member] | Maximum [Member]
Class Of Stock [Line Items]
Award vesting percentage	120.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share Based Compensation Award Tranche Four [Member]
Class Of Stock [Line Items]
Award vesting percentage	20.00%
Stock units vesting year	2021
Inducement Award Performance-Based Restricted Stock Units [Member] | Share Based Compensation Award Tranche Four [Member] | Minimum [Member]
Class Of Stock [Line Items]
Award vesting percentage	0.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share Based Compensation Award Tranche Four [Member] | Maximum [Member]
Class Of Stock [Line Items]
Award vesting percentage	120.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share Based Compensation Award Tranche Five [Member]
Class Of Stock [Line Items]
Award vesting percentage	20.00%
Stock units vesting year	2020
Share based compensation arrangement, number of shares vested		41,764
Share based compensation arrangement, number of shares forfeited		8,352
Share based compensation arrangement, number of shares eligible to vest upon future performance		158,706
Share based compensation arrangement amendment description and terms		Based on the amendment to the vesting criteria, the remaining 158,706 units eligible to vest upon future performance were divided into three separate but equal tranches with independent vesting criteria based on the achievement of certain regulatory milestones.
Inducement Award Performance-Based Restricted Stock Units [Member] | Share Based Compensation Award Tranche Five [Member] | Minimum [Member]
Class Of Stock [Line Items]
Award vesting percentage	0.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | Share Based Compensation Award Tranche Five [Member] | Maximum [Member]
Class Of Stock [Line Items]
Award vesting percentage	120.00%
Inducement Award Performance-Based Restricted Stock Units [Member] | CEO [Member]
Class Of Stock [Line Items]
Number of shares allocated					208,822

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