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Stock Options - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015	Jun. 18, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	1,987,682	[1]	1,901,140
Weighted average grant-date fair value of options granted	$ 6.02		$ 1.23	$ 0.84
Stock options vested aggregate intrinsic value	$ 3,596,624		$ 7,770,086
Stock options expected to vest aggregate intrinsic value	$ 1,469,154		$ 4,569,243
Total grant date fair value of shares vested	322,804		176,597	345,174
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans	$ 2,453,342		$ 522,818	$ 214,304
Unrecognized compensation cost related to unvested stock options and restricted stock granted under the plans, period for recognition	3 years
Restricted Stock | Chief Financial Officer And Chief Operating Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted common stock granted			57,475
Fair value of common stock granted, per share			$ 2.00
Vested percentage of common stock	100.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period for stock options granted to employees	1 year
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Service period for stock options granted to employees	4 years
Authorized for Grants under the 2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	633,052	[1]	709,750
Rolled from 2013 Equity Incentive Plan to 2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	429,750
Authorized for Grants under the 2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, reserved for future issuance	0		0
Common stock authorized under equity incentive plan					1,200,000
Vested options cancellation days, after termination of employee			90 days
[1] Treasury stock in the amount of 135,000 are excluded from the table above.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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