Customer Concentration (Tables)

12 Months Ended

Dec. 31, 2019

Risks and Uncertainties [Abstract]

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

The percentage of total revenue recognized, which individually accounted for 10% or more of the Company’s total revenues in one or more of the periods presented below, was as follows:

	Year Ended December 31,
(in thousands)	2019		2018		2017
AcelRx	(104	)%	(1	)%	2	%
Assertio	48	%	42	%	52	%
Biogen	—	%	2	%	11	%
LENSAR	56	%	12	%	5	%
Noden	101	%	41	%	22	%

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

Total revenues by geographic area are based on the country of domicile of the counterparty to the agreement are as follows:

	Year Ended December 31,
(in thousands)	2019		2018		2017
United States	$	10,143	$	148,622	$	291,448
Europe	26,254		27,709		16,144
Rest of world	18,360		21,779		12,468
Total revenues	$	54,757	$	198,110	$	320,060

The following tables presents total receivables which individually account for 10% or more of the Company’s total receivables balance:

	December 31,
(in thousands)	2019		2018
Assertio	$	3,176	$	—
Cardinal Health	$	1,071	$	2,732
McKesson	$	1,311	$	2,352
AmerisourceBergen	$	823	$	4,330