Accounts Payable, Accrued Expenses and Other - Schedule of Accounts Payable, Accrued Expenses and Other (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable	$ 9,698	$ 2,510
Accrued goods and services	16,459	17,481
Accrued clinical trial costs	10,125	7,637
Accrued payroll and related benefits	4,745	6,166
Accrued interest	1,549	2,956
Accrued dividends payable	19	19
Deferred tax incentives	384	467
Total accounts payable, accrued expenses and other	$ 42,979	$ 37,236