Equity Compensation Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Number of Options
Outstanding, beginning balance (in Shares)	3,418,000
Granted (in Shares)	3,088,000	0
Exercised (in Shares)	0
Forfeited (in Shares)	(1,333,000)
Outstanding, ending balance (in Shares)	5,173,000	3,418,000
Options, exercisable (in Shares)	1,713,000
Weighted Average Exercise Price
Outstanding, beginning balance (in Dollars per share)	$ 28.55
Granted (in Dollars per share)	4.27
Exercised (in Dollars per share)	0
Forfeited (in Dollars per share)	26.22
Outstanding, ending balance (in Dollars per share)	14.66	$ 28.55
Weighted average exercise price, exercisable (in Dollars per share)	$ 30.48
Weighted Average Remaining Contractual Term (Years)
Weighted Average Remaining Contractual Term	7 years 18 days	3 years 8 months 8 days
Weighted Average Remaining Contractual Term, exercisable	3 years 5 months 1 day
Aggregate Intrinsic Value (in thousands)
Aggregate Intrinsic Value	$ 120	$ 0
Aggregate Intrinsic Value, exercisable	$ 0