Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2017	Jan. 01, 2017
Basis Of Presentation [Line Items]
Reduction in accrued clinical trial costs	$ 1,500
ASU 2016-09 [Member]
Basis Of Presentation [Line Items]
Cumulative-effect adjustment to stockholders' equity		$ 45

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant