Summary of Significant Accounting Policies - Additional Information (10-Q) (Details) - customer	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of customers	3
Credit Concentration Risk \| Trade Accounts Receivable \| Three Major Customers, Cardinal Health, Inc., McKesson Corporation And AmerisourceBergen Corporation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage	89.00%	88.00%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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