Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)		1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 01, 2019 USD ($)	Oct. 31, 2011 shares	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) Segment $ / shares	Dec. 31, 2017 USD ($) $ / shares shares
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Maximum maturity period of cash and cash equivalent				Three months
Inventory			$ 56,012	$ 56,012	$ 0
Deferred rent and lease incentive in accrued expenses and other liabilities			188,207	188,207	181,467
Proceeds of Warrants					3,209,423
Upfront license fees			$ 500,000	$ 500,000	$ 0
Statutory rate				21.00%	34.00%
Stock option exercise price range, Minimum | $ / shares				$ 0.79	$ 0.47
Stock option exercise price range, Maximum | $ / shares				$ 4.64	$ 4.64
Number of reportable segment | Segment				1
Lease Expiration Date				Nov. 30, 2022
U.S. federal corporate tax rate [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Statutory rate					35.00%
Furniture and Equipment [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life of assets				5 years
Subsequent Event [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Additional assets	$ 1,000,000
Corresponding liability	$ 1,500,000
October 28, 2011 Warrants [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Warrants issued in offering | shares		1,523,370
October 28, 2011 Warrants [Member] | Warrants Liability, at Fair Value [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Warrants expiration date				May 02, 2017
Number of warrants exercised during the period | shares					613,913
Proceeds of Warrants					$ 798,087
Other Income, Net [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Unrealized gain(loss),trading securities				$ (29,430)	$ 29,430
Minimum [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Minimum amortization period of compensation cost on straight line basis				1 year
Minimum [Member] | Leasehold Improvements [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life of assets				4 years
Minimum [Member] | Computer Equipment [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life of assets				3 years
Maximum [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Minimum amortization period of compensation cost on straight line basis				5 years
Maximum [Member] | Leasehold Improvements [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life of assets				7 years
Maximum [Member] | Computer Equipment [Member]
Summary Of Basis Of Presentation And Significant Accounting Policies [Line Items]
Useful life of assets				5 years