Long-term Debt (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended
	Oct. 31, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Equity option	$ 20,000,000
Equity option to be exercised in the current year	$ 10,000,000
Equity options, purchase price as a percentage of share price	105.00%
Equity commitment, number of consecutive trading days used for measuring share price	5 days
Common Shares
Debt Instrument [Line Items]
Warrants exercisable as a percentage of principal amount of loan	3.00%
Number of securities exercisable by warrant (in shares)	49,800
Exercise price of warrants (in USD per share)	$ 15.06
Fair value of warrant on date of issuance	$ 500,000
Private Placement
Debt Instrument [Line Items]
Shares purchased by NovaQuest (in shares)	138,361
Shares purchased by NovaQuest	$ 2,000,000
Line of Credit | NovaQuest Securities Purchase Agreement
Debt Instrument [Line Items]
Maximum borrowing commitment	60,000,000
Minimum borrowing commitment	30,000,000
Debt issued	$ 6,000,000
Interest rate	15.00%
Quarterly interest rate	5.00%
Deferred interest rate	10.00%
Default interest rate	5.00%
Equity commitment related to note issuance, portion of note issuance amount	0.3333
Equity commitment related to note issuance	$ 20,000,000
Financing expenses	1,000,000
Amortized deferred financing costs		$ 100,000
Term Loan | Hercules Loan Agreement
Debt Instrument [Line Items]
Maximum borrowing commitment	$ 40,000,000
Interest rate	8.25%
Current interest rate		8.50%
Default interest rate	5.00%
Discount	$ 2,100,000
Financing expenses	1,300,000
Amortized deferred financing costs		$ 300,000
Principal amount funded	25,000,000
Remaining borrowing commitment	$ 15,000,000
End of term charge	6.55%
Term Loan | Hercules Loan Agreement | Prime Rate
Debt Instrument [Line Items]
Variable interest rate	4.00%