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Helio Vision Acquisition - Additional Information (Detail) - Helio Vision Inc [Member] $ in Millions	Jan. 28, 2019 USD ($) shares
Business Acquisition [Line Items]
Business combination, stock issued | shares	1,407,006
Common Stock after FDA Approval prior to 10th Anniversary [Member]
Business Acquisition [Line Items]
Business combination, contingent consideration liability | $	$ 10.0
Common Stock after FDA Approval Prior to 12th Anniversary [Member]
Business Acquisition [Line Items]
Business combination, contingent consideration liability | $	$ 2.5
Common Stock after FDA Approval Prior to 12th Anniversary [Member] | Maximum [Member]
Business Acquisition [Line Items]
Business combination, contingent consideration stock to be issued | shares	5,248,885
Tax Gross-up Payment in Event of Change of Control or Divesture [Member] | Maximum [Member]
Business Acquisition [Line Items]
Business combination, contingent consideration liability | $	$ 1.0
Founders [Member]
Business Acquisition [Line Items]
Business combination, stock issued | shares	246,562

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