Stock-Based Compensation, Stock Option Activity (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Unamortized Stock Compensation Expense [Abstract]
Unamortized stock compensation expense		$ 1,937,920
Stock Options [Member]
Number of Shares [Roll Forward]
Options outstanding, beginning balance (in shares)		541,117
Assumed in connection with Merger (in shares)		347,697
Granted (in shares)	0	800,137	0
Exercised (in shares)		0
Forfeited (in shares)		(270,650)
Options outstanding, ending balance (in shares)		1,418,301
Vested and expected to vest (in shares)		1,418,301
Exercisable (in shares)		1,007,871
Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning balance (in dollars per share)		$ 7.20
Assumed in connection with merger (in dollars per share)		121.52
Granted (in dollars per share)		7.57
Exercised (in dollars per share)		0
Forfeited (in dollars per share)		99.13
Options outstanding, ending balance (in dollars per share)		17.90
Vested and expected to vest (in dollars per share)		17.90
Exercisable (in dollars per share)		$ 22.67
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value [Abstract]
Options outstanding, weighted average remaining contractual life		7 years 5 months 26 days
Vested and expected to vest, weighted average remaining contractual life		7 years 5 months 26 days
Exercisable, weighted average remaining contractual life		6 years 5 months 19 days
Options outstanding, aggregate intrinsic value		$ 24,059
Vested and expected to vest, aggregate intrinsic value		24,059
Exercisable, aggregate intrinsic value		$ 24,059
Unamortized Stock Compensation Expense [Abstract]
Period for recognition		3 years 10 months 10 days