Earnings (Loss) per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic loss per share attributable to common stock: Numerator
Net loss	$ (2,459,072)	$ (4,700,248)	$ (8,434,543)	$ (15,651,274)
Denominator
Weighted avg. common shares outstanding (in shares)	21,266,639	20,890,580	21,265,247	19,666,131
Basic loss per share attributable to common stock (in dollars per share)	$ (0.12)	$ (0.22)	$ (0.40)	$ (0.80)
Diluted loss per share attributable to common stock: Numerator
Net loss	$ (2,459,072)	$ (4,700,248)	$ (8,434,543)	$ (15,651,274)
Denominator
Weighted avg. common shares outstanding (in shares)	21,266,639	20,890,580	21,265,247	19,666,131
Diluted loss per share attributable to common stock (in dollars per share)	$ (0.12)	$ (0.22)	$ (0.40)	$ (0.80)