Debt (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Schedule of Net Carrying Amount of Liability Component

The net carrying amount of the liability component of the Notes as of September 30, 2013 consists of the following (in thousands):

Principal amount	$	150,000
Unamortized debt discount	(37,698		)
Net carrying amount	$	112,302

Schedule of Interest Expense on Notes Recognized

The following table presents the interest expense recognized related to the Notes for the three months ended September 30, 2013 (in thousands):

Contractual interest expense at 1.5% per annum	$	296
Amortization of debt issuance costs	79
Accretion of debt discount	845
Total	$	1,220