14. Concentrations (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Company's customers that individually comprised greater than 10% of total gross product sales
Percentage of gross product sales	88.00%	93.00%
McKesson Corporation
Company's customers that individually comprised greater than 10% of total gross product sales
Percentage of gross product sales	34.00%	36.00%
Amerisource Bergen Drug Corporation
Company's customers that individually comprised greater than 10% of total gross product sales
Percentage of gross product sales	30.00%	31.00%
Cardinal Health Inc
Company's customers that individually comprised greater than 10% of total gross product sales
Percentage of gross product sales	24.00%	26.00%