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Summary of Significant Accounting Policies - Percentage of Net Product Sales and Accounts Receivable Balance (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2019
Revenue Benchmark
Product Information [Line Items]
Concentration risk percentage	97.80%
Revenue Benchmark | Largest Customer
Product Information [Line Items]
Concentration risk percentage	40.90%
Revenue Benchmark | Second Largest Customer
Product Information [Line Items]
Concentration risk percentage	39.50%
Revenue Benchmark | Third Largest Customer
Product Information [Line Items]
Concentration risk percentage	17.40%
Accounts Receivable
Product Information [Line Items]
Concentration risk percentage	99.20%
Accounts Receivable | Largest Customer
Product Information [Line Items]
Concentration risk percentage	48.90%
Accounts Receivable | Second Largest Customer
Product Information [Line Items]
Concentration risk percentage	38.60%
Accounts Receivable | Third Largest Customer
Product Information [Line Items]
Concentration risk percentage	11.70%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611

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-Topic 275
-SubTopic 10
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No definition available.

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