Net Income Per Share - Summary of Computation of Net Income Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income	$ 234,353	$ 1,183,044	$ 549,323	$ 2,633,405
Accretion of dividends on preferred convertible stock		(322,170)		(1,537,021)
Net income attributable to common stockholders	234,353	860,874	549,323	1,096,384
Accretion of dividends on preferred stock		186,868		125,205
Adjustment for change in fair value of warrant liability				(460,289)
Net income attributable to common stockholders - diluted	$ 234,353	$ 1,047,742	$ 549,323	$ 761,300
Weighted average shares used in calculating income per share:
Basic	9,545,235	4,133,020	9,475,708	1,849,647
Diluted	10,169,559	6,689,332	10,238,987	3,103,784
Net income per share:
Basic	$ 0.02	$ 0.21	$ 0.06	$ 0.59
Diluted	$ 0.02	$ 0.16	$ 0.05	$ 0.25