Collaborative Research and Development Agreements (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended			12 Months Ended
	Feb. 01, 2012 Merck [Member]	Mar. 31, 2014 Merck [Member]	Mar. 31, 2013 Merck [Member]	Mar. 31, 2014 Arch [Member]	Dec. 31, 2013 Arch [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Term of collaborative research and development agreement (years)	5 years
Deferred Revenue		$ 2,404
Sales Revenue, Services, Net		492	328
Sales Revenue, Goods, Net		0	505	39	2,134
Allowance for Doubtful Accounts Receivable, Charge-offs					$ 387