Borrowings (Tables)

3 Months Ended

Mar. 31, 2013

Debt Disclosure [Abstract]

Summary of Company's Financial Statements

The following table shows the amounts recorded within the Company’s financial statements with respect to the Notes (in thousands):

	March 31, 2013			December 31, 2012
Convertible debt principal	$	120,000		$	120,000
Unamortized debt discount		(32,311	)		(33,549	)
Net carrying amount of convertible debt	$	87,689		$	86,451

Summary of Interest Expense Recognized

The following table presents the interest expense recognized related to the Notes (in thousands):

	Three Months Ended March 31,
	2013		2012
Contractual interest expense	$	450	$	450
Amortization of debt issuance costs		101		101
Accretion of debt discount		1,238		1,141
Net interest expense	$	1,789	$	1,692

Aggregate Maturities of Borrowings

The aggregate maturities of borrowings as of March 31, 2013 were as follows (in thousands):

2013	$	539
2014		128
2015		128
2016		73
2017, and thereafter		120,073
	$	120,941