Accounts Receivable, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Accounts Receivable, Net
Net Accounts receivable	$ 10,115	$ 6,842
Accounts Receivable. | Accounts receivable balances | AmerisourceBergen Drug Corporation.
Customers representing greater than 10% of accounts receivable balances
Accounts receivable by major customer (as a percent)	52.00%	49.00%
Accounts Receivable. | Accounts receivable balances | McKesson Corporation
Customers representing greater than 10% of accounts receivable balances
Accounts receivable by major customer (as a percent)	27.00%	27.00%
Accounts Receivable. | Accounts receivable balances | Cardinal Health, Inc
Customers representing greater than 10% of accounts receivable balances
Accounts receivable by major customer (as a percent)	15.00%	16.00%