Deferred Revenue - Summary of Deferred Revenue Activity (Details)	6 Months Ended
	Jun. 30, 2018 USD ($)
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period	$ 2,495,000
Increase to deferred revenue	500,000
Recognized as revenue	(152,000)
Balance at end of period	2,843,000
BED
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period	895,000
Increase to deferred revenue	0
Recognized as revenue	(108,000)
Balance at end of period	787,000
Other Opioid Treatments
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period	1,600,000
Increase to deferred revenue	0
Recognized as revenue	0
Balance at end of period	1,600,000
Grants
Movement in Deferred Revenue [Roll Forward]
Balance at beginning of period	0
Increase to deferred revenue	500,000
Recognized as revenue	(44,000)
Balance at end of period	$ 456,000