Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of accrued expenses
Accrued sales and marketing	$ 3,964	$ 3,402
Accrued compensation and benefits	3,503	10,080
Accrued manufacturing	1,150	1,351
Accrued rent obligations	1,014	1,103
Other	3,720	2,882
Total accrued expenses	$ 13,351	$ 18,818

For a classified balance sheet, the cumulative difference as of the balance sheet date between the payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, within one year of the balance sheet date.

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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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