Stock-Based Compensation, Stock Option Activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Unamortized Stock Compensation Expense [Abstract]
Unamortized stock compensation expense	$ 0
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)	389,707	0
Exercised (in shares)	0
Forfeited (in shares)	(55,521)
Options outstanding, ending balance (in shares)	1,223,000
Vested and expected to vest (in shares)	1,223,000
Exercisable (in shares)	1,223,000
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)	9.04
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	5.01
Options outstanding, ending balance (in dollars per share)	40.39
Vested and expected to vest (in dollars per share)	40.39
Exercisable (in dollars per share)	$ 40.39
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value [Abstract]
Options outstanding, weighted average remaining contractual life	6 years 6 months 7 days
Vested and expected to vest, weighted average remaining contractual life	6 years 6 months 7 days
Exercisable, weighted average remaining contractual life	6 years 6 months 7 days
Options outstanding, aggregate intrinsic value	$ 357,168
Vested and expected to vest, aggregate intrinsic value	357,168
Exercisable, aggregate intrinsic value	$ 357,168
Unamortized Stock Compensation Expense [Abstract]
Period for recognition	0 years