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Consolidated Balance Sheet Details - Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Balance Sheet Related Disclosures [Abstract]
Accrued discounts and allowances	$ 4,088	$ 2,153
Accrued product returns	3,034	2,446
Accrued interest expense, current portion	2,526	1,924
Astellas tail payment, current portion	1,820	0
Other accrued expenses	2,875	4,225
Accrued expenses	$ 14,343	$ 10,748

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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