Material Agreements, Agreement to Terminate CLA with KemPharm (Details) - Agreement to Terminate CLA with KemPharm [Member] - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2020
Agreement to Terminate CLA with KemPharm [Abstract]
Revenues	$ 1,000	$ 500
Percentage share of milestone payments paid	10.00%
Maximum payments under agreement		$ 4,800

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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+ Details