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Intangible Assets - Summary and Other (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Nov. 30, 2013	Sep. 30, 2018	Sep. 30, 2018
Composition of intangible assets
Amortization expense		$ 0.9	$ 2.6
GMP royalty buyout
Composition of intangible assets
Intangible asset purchase amount	$ 17.5
Buy-out Agreement with GMP | GMP royalty buyout
Composition of intangible assets
Useful life/amortization period	5 years
Notes Payable | Buy-out Agreement with GMP | GMP Note Parties
Composition of intangible assets
Face amount at time of issuance	$ 17.5

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

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-Publisher FASB
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