Mezzanine and Stockholders' Equity - Warrants (Details) - $ / shares	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Class of Warrant or Right [Line Items]
Warrants Outstanding (in shares)	3,290,371
Weighted Average Remaining Contractual Life	2 years 5 months 23 days
Warrants Exercisable (in shares)	3,290,371
Weighted Average Exercise Price Per Share (in dollars per share)	$ 9.93	$ 9.93
Exercise Price Per Share, 9.00
Class of Warrant or Right [Line Items]
Exercise Price Per Share (in dollars per share)	$ 9
Warrants Outstanding (in shares)	1,053,269
Weighted Average Remaining Contractual Life	1 year 3 months 15 days
Warrants Exercisable (in shares)	1,053,269
Weighted Average Exercise Price Per Share (in dollars per share)	$ 9.00
Exercise Price Per Share, 10.00
Class of Warrant or Right [Line Items]
Exercise Price Per Share (in dollars per share)	$ 10
Warrants Outstanding (in shares)	1,408,220
Weighted Average Remaining Contractual Life	2 years 9 months 18 days
Warrants Exercisable (in shares)	1,408,220
Weighted Average Exercise Price Per Share (in dollars per share)	$ 10.00
Exercise Price Per Share, 11.00
Class of Warrant or Right [Line Items]
Exercise Price Per Share (in dollars per share)	$ 11
Warrants Outstanding (in shares)	828,882
Weighted Average Remaining Contractual Life	3 years 5 months 9 days
Warrants Exercisable (in shares)	828,882
Weighted Average Exercise Price Per Share (in dollars per share)	$ 11.00
Minimum
Class of Warrant or Right [Line Items]
Exercise Price Per Share (in dollars per share)	9.00
Maximum
Class of Warrant or Right [Line Items]
Exercise Price Per Share (in dollars per share)	$ 11.00