Description of Business (Detail)		12 Months Ended
	Aug. 10, 2018 USD ($)	Dec. 31, 2018 Subsidiary shares	Aug. 06, 2018 shares	Dec. 31, 2017 shares
Subsidiary or Equity Method Investee [Line Items]
Number of subsidiaries | Subsidiary		2
Common stock, issued (shares)		11,298,239		11,279,834
Payment to be exchanged for right to purchase stock, maximum | $	$ 30,000,000
Paid amount after execution of SAFE | $	$ 10,500,000
GPI
Subsidiary or Equity Method Investee [Line Items]
Ownership percentage		50.00%
Consideration For License Agreement, Assignment Of Intellectual Property, Pursuant To Contribution And Subscription Agreement | GPI
Subsidiary or Equity Method Investee [Line Items]
Common stock, issued (shares)			1,000
Everon Contributed Intellectual Property To GPI In Exchange for Shares | GPI
Subsidiary or Equity Method Investee [Line Items]
Common stock, issued (shares)			1,000
Shares Received By The Company And Everon, From GPI | GPI
Subsidiary or Equity Method Investee [Line Items]
shares received			1,000
The Company And Everon Ownership In GPI | GPI
Subsidiary or Equity Method Investee [Line Items]
Ownership interest percentage			50.00%
BioLab 612
Subsidiary or Equity Method Investee [Line Items]
Number of wholly-owned subsidiaries | Subsidiary		1