Borrowings (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Schedule of Future Minimum Payments under the Loans Payable

Future minimum payments under indebtedness agreements outstanding as of June 30, 2015 are as follows:

(in thousands) As of June 30, 2015:	4.50% Convertible Senior Notes			Loan Agreement
Remainder of 2015	$	2,813		$	2,157
2016		5,625			13,575
2017		5,625			18,167
2018		5,625			16,639
2019 and thereafter		136,250			—
		155,938			50,538
Less interest		(30,938	)		(9,337	)
Less unamortized discount		(40,396	)		(1,630	)
Less current portion		—			(1,058	)
Loans payable, net of current portion	$	84,604		$	38,513