Significant Accounting Policies, Cash, Cash Equivalents and Short-term Investments, Inventory Valuation, and Research, Development and Patent Expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Inventory valuation [Abstract]
Raw materials	6,839	$ 6,290
Maximum [Member] | Privately- and Publicly-Held Biotechnology Companies [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity investments (in hundredths)	20.00%