Stockholders Deficit - Additional Information (Details) - USD ($)					1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2018	Jan. 29, 2018	Jun. 30, 2017	Apr. 30, 2017	Mar. 31, 2019	Jan. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Class Of Stock [Line Items]
Issuance of common stock from the ATM Offering, Shares								5,733,314
Gross proceeds from issuance of common stock							$ 0	$ 21,100,000
Sales commission								600,000
Other offering expenses paid								200,000
Net proceeds from issuance of common stock from the ATM Offering								20,200,000
Deferred offering costs					$ 198,088		198,088		$ 59,030
Stock-based compensation							241,246	1,143,458
Selling, General and Administrative
Class Of Stock [Line Items]
Stock-based compensation							181,981	1,101,992
Restricted Stock Units R S U
Class Of Stock [Line Items]
Unrecognized compensation expense					668,219		$ 668,219
Compensation expense period expected to be recognized							3 years 18 days
Vested and unissued RSU awards, description							Vested and unissued awards at March 31, 2019 represents RSU awards granted on August 16, 2018 for which the vesting date was March 31, 2019, but for which issuance of the awards occurred on the next business day, April 1, 2019.
Vested and unissued RSU awards granted date							Aug. 16, 2018
Vested and unissued RSU awards vesting date							Mar. 31, 2019
Vested and unissued RSU awards issuance date							Apr. 01, 2019
Issuance of shares granted							15,000
Restricted stock grant date fair value							$ 2.31
Restricted Stock Units R S U | Executive Officers
Class Of Stock [Line Items]
Issuance of shares granted		259,551
Restricted stock grant date fair value		$ 3.84
Restricted Stock Units R S U | Selling, General and Administrative | Executive Officers
Class Of Stock [Line Items]
Stock-based compensation								$ 1,000,000
Two Thousand Fourteen Equity Incentive Plan | Employee Stock Option
Class Of Stock [Line Items]
Unrecognized compensation expense					$ 1,427,673		$ 1,427,673
Compensation expense period expected to be recognized							2 years 10 months 20 days
Underwritten Public Offering
Class Of Stock [Line Items]
Common stock price per share	$ 2.90					$ 2.90
Issuance of common stock from the ATM Offering, Shares						13,915,000
Net proceeds from initial public offering after underwriters' discounts, commissions and offering expenses							$ 0		$ 37,700,000
Over-Allotment Option
Class Of Stock [Line Items]
Issuance of common stock from the ATM Offering, Shares						1,815,000
Common Stock
Class Of Stock [Line Items]
Issuance of common stock from the ATM Offering, Shares								261,352
Gross proceeds from issuance of common stock								$ 600,000
Sales Agreement
Class Of Stock [Line Items]
Common stock price per share				$ 0.001
Common stock aggregate offering price	$ 23,000,000		$ 40,000,000	$ 20,000,000
Cowen ATM Offering
Class Of Stock [Line Items]
Common stock price per share					$ 0.001		$ 0.001
Common stock aggregate offering price					$ 40,000,000
Issuance of common stock from the ATM Offering, Shares							0
Deferred offering costs					$ 200,000		$ 200,000