Accounts Receivable, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Accounts Receivable, Net
Net Accounts receivable	8,519	6,410
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)	49.00%	48.00%
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%	28.00%
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)	16.00%	18.00%