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Consolidated Balance Sheet Details - Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Balance Sheet Related Disclosures [Abstract]
Accrued product returns	$ 5,445	$ 3,034
Accrued discounts and allowances	4,239	4,088
Accrued interest expense, current portion	3,033	2,526
Accrued clinical trial costs	1,238	1,012
Accrued sales and marketing costs	1,161	304
Astellas tail payment, current portion	1,131	1,820
Other accrued expenses	2,618	1,559
Accrued expenses	$ 18,865	$ 14,343

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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