Subsequent Events (Details) - Subsequent Event - USD ($)				2 Months Ended
	Mar. 18, 2019	Jan. 15, 2019	Jan. 03, 2019	Feb. 22, 2019
Subsequent Event [Line Items]
Options granted (in shares)		13,200	76,500
Exercise of stock options (in shares)				80,000
Proceeds from stock options exercised				$ 601,250
Third Party Licensee
Subsequent Event [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	$ 9,000,000.0
Adapt | SWK Purchase Agreement
Subsequent Event [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	6,500,000.0
Milestone payment to be received if requirements are met	2,700,000
EBS
Subsequent Event [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	1,800,000
EBS | SWK Purchase Agreement
Subsequent Event [Line Items]
Maximum reduction in quarterly royalty payable payments in next twelve months	2,000,000.0
Milestone payment to be received if requirements are met	2,500,000
Narcan
Subsequent Event [Line Items]
Minimum sales requirement for milestone payment	200,000,000
Milestone payment to be received if requirements are met	$ 15,000,000
Employee Stock Option
Subsequent Event [Line Items]
Expiration period			10 years
Employee Stock Option | End of one year
Subsequent Event [Line Items]
Granted (in dollars per share)		$ 14.62	$ 13.61
Employee Stock Option | Monthly after year one
Subsequent Event [Line Items]
Award vesting rights, percentage			2.0833%