Borrowings (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Schedule of Future Minimum Payments under the Loans Payable

Future minimum payments under indebtedness agreements outstanding as of March 31, 2015 are as follows:

(in thousands) As of March 31, 2015:	4.50% Convertible Senior Notes			Loan Agreement
Remainder of 2015	$	2,813		$	3,224
2016		5,625			13,575
2017		5,625			18,167
2018		5,625			16,639
2019 and thereafter		136,250			—
		155,938			51,605
Less interest		(30,938	)		(10,405	)
Less unamortized discount		(42,401	)		(1,719	)
Less current portion		—			—
Loans payable, net of current portion	$	82,599		$	39,481