Summary of Significant Accounting Policies - Additional Information (10-Q) (Details)	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
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	86.00%	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://www.xbrl.org/2003/role/disclosureRef
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