Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Geographic Information for Property and Equipment, Net of Accumulated Depreciation

Geographic information for property and equipment, net of accumulated depreciation at December 31, 2017 and 2016 is as follows:

	December 31,
(Dollars in thousands)	2017		2016
United States	$	751	$	920
China	4,718		9,299
Total property and equipment, net	$	5,469	$	10,219

Major Customers and Concentration of Credit Risk

Estimated revenue from significant customers as a percentage of the Company’s consolidated gross revenue was as follows:

	Year Ended December 31,
	2017		2016
McKesson Corporation	38.3	%	35.7	%
AmerisourceBergen Corporation	28.0	%	31.0	%
Cardinal Health	24.6	%	24.3	%

The Company’s three largest customers accounted for receivables in excess of ten percent of gross accounts receivable at December 31, 2017 and 2016:

	December 31,
	2017		2016
Amerisource Bergen Corporation	32.3	%	47.0	%
McKesson Corporation	35.4	%	25.4	%
Cardinal Health	22.6	%	17.0	%