Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018 Segment Group
Accounting Policies [Line Items]
Date of incorporation		May 01, 1998
Entity incorporated, State		Delaware
Number of operating segments | Segment		1
Number of customer groups | Group		2
Financing Agreement with Biopharma
Accounting Policies [Line Items]
Payments as equivalent percentage of sales		20.00%
Debt obligation, periodic payment		quarterly
Maximum
Accounting Policies [Line Items]
Investments maturity at time of purchase		36 months
Maximum | Sales Revenue, Net | Customer Concentration Risk
Accounting Policies [Line Items]
Percentage of sales to one specialty distributor	1.00%	1.00%