Organization and Basis of Presentation - Additional Information (Detail) - USD ($)		12 Months Ended
	Jan. 05, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Organization And Basis Of Presentation [Line Items]
Month and year of incorporation		2007-01
Cash and cash equivalents		$ 5,319,004	$ 7,679,267	$ 9,007,071
Subsequent Event [Member] | NGP Credit Agreement [Member]
Organization And Basis Of Presentation [Line Items]
Line of credit	$ 5,000,000
Subsequent Event [Member] | Third-Party Wholesale Distributor [Member] | NGP Credit Agreement [Member]
Organization And Basis Of Presentation [Line Items]
Minimum financing arrangements from purchase order not to avail line of credit.	$ 2,500,000
NGP Agreement [Member] | Subsequent Event [Member]
Organization And Basis Of Presentation [Line Items]
Term of agreement	5 years
Recapture percentage of product sales after agreement term	100.00%
Minimum termination fee	$ 5,000,000
Agreement termination fee description	The Company may also terminate the NGP Agreement upon a change of control of the Company, subject to a one-time payment equal to between four times and one times annualized service fees paid by the Company under the NGP Agreement, with such amount based on which year (between one and five years) after commercial launch the change of control occurs, provided if the change of control occurs within one year of commercial launch, such amount will be the greater of the specified annualized service fee amount and $5 million.
NGP Agreement [Member] | Subsequent Event [Member] | Gimoti [Member] | Minimum [Member]
Organization And Basis Of Presentation [Line Items]
Percentage of product profits	80.00%