Stock-Based Compensation, Stock Option Activity (Details) - USD ($)		12 Months Ended
	Mar. 13, 2019	Dec. 31, 2019	Dec. 31, 2018
Unamortized Stock Compensation Expense [Abstract]
Unamortized stock compensation expense		$ 1,681,000
Weighted-average grant date fair value, granted (in dollars per share)	$ 8.23
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)		828,637
Exercised (in shares)		0
Forfeited (in shares)		(295,654)
Options outstanding, ending balance (in shares)		1,421,797	541,117
Vested and expected to vest (in shares)		1,421,797
Exercisable (in shares)		1,000,367
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)		7.43
Exercised (in dollars per share)		0
Forfeited (in dollars per share)		99.27
Options outstanding, ending balance (in dollars per share)		15.95	$ 7.20
Vested and expected to vest (in dollars per share)		15.95
Exercisable (in dollars per share)		$ 20.15
Remaining Contractual Life and Aggregate Intrinsic Value [Abstract]
Options outstanding, weighted average remaining contractual life		7 years 1 month 2 days	4 years 3 months 14 days
Assumed in connection with merger, weighted average remaining contractual life		5 years 8 months 1 day
Granted, weighted average remaining contractual life		9 years 4 months 6 days
Vested and expected to vest, weighted average contractual life		7 years 1 month 2 days
Exercisable, weighted average contractual life		6 years 11 days
Options outstanding, aggregate intrinsic value		$ 0	$ 0
Assumed in connection with merger, aggregate intrinsic value		0
Granted, aggregate intrinsic value		0
Vested and expected to vest, aggregate intrinsic value		0
Exercisable, aggregate intrinsic value		$ 0
Unamortized Stock Compensation Expense [Abstract]
Period for recognition		3 years 4 months 17 days
Weighted-average grant date fair value, granted (in dollars per share)		$ 5.67