ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of useful lives of property and equipment

Depreciation is calculated using the straight-line method over the estimated useful lives of the respective assets, as follows:

Furniture and office equipment	3 - 5 years
Machinery and equipment	5 - 7 years
Laboratory equipment	3 - 5 years
Leasehold improvements	Shorter of estimated useful life or lease term

Schedule of sales and accounts receivable customer concentration risk

The three large, national wholesale distributors represent the vast majority of the Company’s business and represented the following percentages of product shipments and accounts receivable for the years ended December 31, 2018, 2017 and 2016.

	Consolidated revenue						Accounts Receivable related to product sales
	2018		2017		2016		2018		2017		2016
McKesson Corporation	14	%	36	%	36	%	28	%	41	%	39	%
AmerisourceBergen Corporation	13	%	27	%	27	%	28	%	27	%	33	%
Cardinal Health	11	%	26	%	25	%	32	%	23	%	20	%
Collegium	55	%	—	%	—	%	—	%	—	%	—	%
All others	7	%	11	%	12	%	12	%	9	%	8	%
Total	100	%	100	%	100	%	100	%	100	%	100	%