Borrowings (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

Schedule of Future Minimum Payments under the Loans Payable

Future minimum payments under indebtedness agreements outstanding as of June 30, 2014 are as follows:

As of June 30, 2014: (in thousands)	4.50% Convertible Senior Notes			Loan Agreement
Remainder of 2014	$	2,813		$	5,626
2015		5,625			18,135
2016		5,625			23,804
2017		5,625			—
2018 and thereafter		141,875			—
	$	161,563		$	47,565
Less interest		(36,563	)		(6,365	)
Less unamortized discount		(48,413	)		(1,862	)
Less current portion		—			(10,790	)
Loans payable, net of current portion	$	76,587		$	28,548