Commitments and Contingencies (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
CDC
Contingencies And Commitments [Line Items]
Royalties received			$ 20,000.00
Granted royalty on sales of the next BEMA product			1.00%
Net sales of next BEMA Product			$ 7,500,000
Minimum | CDC
Contingencies And Commitments [Line Items]
Royalties received		$ 375,000
Opioid PMR Consortium
Contingencies And Commitments [Line Items]
Participation expense	$ 4,300,000