Customer, Supplier and Product Concentration - Percentage of the Company's Gross and Net Sales and Accounts Receivable (Details) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Concentration Risk [Line Items]
Customer concentration					77.80%
Gross Sales [Member]
Concentration Risk [Line Items]
Customer concentration	76.00%	79.00%	78.00%	73.00%		76.90%	58.40%
Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Customer concentration	66.00%	43.00%	69.00%	46.00%	70.00%	61.90%	40.90%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Customer concentration			78.00%		82.80%	85.00%	63.30%
Amerisource [Member]
Concentration Risk [Line Items]
Customer concentration					28.00%
Amerisource [Member] | Gross Sales [Member]
Concentration Risk [Line Items]
Customer concentration						38.30%	18.90%
Amerisource [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Customer concentration					23.20%	29.20%	14.00%
Amerisource [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Customer concentration					28.80%	45.40%	25.50%
Cardinal [Member]
Concentration Risk [Line Items]
Customer concentration					19.70%
Cardinal [Member] | Gross Sales [Member]
Concentration Risk [Line Items]
Customer concentration						15.90%	22.80%
Cardinal [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Customer concentration					19.50%	13.60%	15.60%
Cardinal [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Customer concentration					26.10%	16.90%	26.20%
McKesson [Member]
Concentration Risk [Line Items]
Customer concentration					30.10%
McKesson [Member] | Gross Sales [Member]
Concentration Risk [Line Items]
Customer concentration						22.70%	16.70%
McKesson [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Customer concentration					27.30%	19.10%	11.30%
McKesson [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Customer concentration					27.90%	22.70%	11.60%