Accounts Receivable (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 18, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total revenue	$ 20,641,000	$ 4,366,000	$ 32,851,000	$ 9,220,000
Accounts receivable	16,068,000		16,068,000			$ 4,489,000
License fees	0		0		$ 5,400,000	5,400,000
BARDA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	100,000		100,000
License fees	4,500,000		4,500,000
Royalty revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total revenue	$ 20,494,000	$ 4,185,000	30,369,000	$ 8,887,000
NARCAN
Accounts, Notes, Loans and Financing Receivable [Line Items]
Milestone payment due			13,500,000
Royalty revenue milestone amount			$ 200,000,000
Accounts receivable						$ 4,500,000