Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Derivatives (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) $ / derivative_instrument
Initial Put Option [Member]
Derivative [Line Items]
Derivative, Equity Value \| $ / derivative_instrument	10.13
Derivative, Average Price Risk Option Strike Price \| $ / derivative_instrument	27.50
Derivative, Term of Contract	6 years 1 month 10 days
Contingent Put Option [Member]
Derivative [Line Items]
Derivative, Term of Contract	3 years 1 month 17 days
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value of derivative, ending balance	$ 400
Forward Contracts [Member]
Derivative [Line Items]
Derivative, Equity Value \| $ / derivative_instrument	29.48
Derivative, Average Price Risk Option Strike Price \| $ / derivative_instrument	20.00
Derivative, Term of Contract	3 years 1 month 17 days
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value of derivative, ending balance	$ 1,900
Initial Put Option [Member]
Derivative [Line Items]
Derivative, Equity Value \| $ / derivative_instrument	29.48
Derivative, Average Price Risk Option Strike Price \| $ / derivative_instrument	20.00
Derivative, Term of Contract	3 years 5 months 16 days
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value of derivative, ending balance	$ 900
Measurement Input, Price Volatility [Member] \| Initial Put Option [Member]
Derivative [Line Items]
Derivative Liability, Measurement Input	0.68
Measurement Input, Price Volatility [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Measurement Input	0.62
Measurement Input, Price Volatility [Member] \| Initial Put Option [Member]
Derivative [Line Items]
Derivative Liability, Measurement Input	0.61
Measurement Input, Risk Free Interest Rate [Member] \| Initial Put Option [Member]
Derivative [Line Items]
Derivative Liability, Measurement Input	0.026
Measurement Input, Risk Free Interest Rate [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Measurement Input	0.029
Measurement Input, Risk Free Interest Rate [Member] \| Initial Put Option [Member]
Derivative [Line Items]
Derivative Liability, Measurement Input	0.029
Measurement Input, Expected Dividend Rate [Member] \| Initial Put Option [Member]
Derivative [Line Items]
Derivative Liability, Measurement Input	0.000
Measurement Input, Expected Dividend Rate [Member] \| Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Measurement Input	0.000
Measurement Input, Expected Dividend Rate [Member] \| Initial Put Option [Member]
Derivative [Line Items]
Derivative Liability, Measurement Input	0.000
Fair Value, Inputs, Level 3 [Member] \| Forward Contracts [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value of derivative, beginning balance	$ 0
Initial fair value of derivative (liability) asset in connection with Collaboration Agreement	1,865
Change in fair value	0
Fair value of derivative, ending balance	1,865
Fair Value, Inputs, Level 3 [Member] \| Initial Put Option [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair value of derivative, beginning balance	0
Initial fair value of derivative (liability) asset in connection with Collaboration Agreement	879
Change in fair value	0
Fair value of derivative, ending balance	$ 879

Derivative, Equity Value

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- Definition

Value of input used to measure derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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Value of input used to measure derivative liability.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The strike price on the price risk option contract such as a put option or a call option.

+ References

No definition available.

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- Definition

Period the derivative contract is outstanding, 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

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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-Topic 820
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-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258

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- Definition

Amount of increase (decrease) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258

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