18. Concentrations (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Company's customers that individually comprised greater than 10% of total gross product sales
Percentage of gross product sales	93.00%	91.00%	79.00%
McKesson Corporation
Company's customers that individually comprised greater than 10% of total gross product sales
Percentage of gross product sales	38.00%	37.00%	35.00%
Amerisource Bergen Drug Corporation
Company's customers that individually comprised greater than 10% of total gross product sales
Percentage of gross product sales	27.00%	31.00%	20.00%
Cardinal Health Inc
Company's customers that individually comprised greater than 10% of total gross product sales
Percentage of gross product sales	28.00%	23.00%	24.00%