Long-term Debt (Key Assumptions Used to Value Warrants) (Details) - Common Shares - $ / shares	1 Months Ended
	Mar. 31, 2018	Oct. 31, 2017
Tranche One
Class of Warrant or Right [Line Items]
Exercise price (in USD per share)		$ 15.06
Common share price on date of issuance (in USD per share)		$ 14.39
Annualized equity volatility		73.20%
Risk-free interest rate		2.15%
Expected dividend yield		0.00%
Contractual term (in years)		7 years
Tranche Two
Class of Warrant or Right [Line Items]
Exercise price (in USD per share)	$ 18.82
Common share price on date of issuance (in USD per share)	$ 18.96
Annualized equity volatility	72.30%
Risk-free interest rate	2.78%
Expected dividend yield	0.00%
Contractual term (in years)	7 years