Accrued Expenses - Summary of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued Liabilities Current [Abstract]
Accrued sales and marketing	$ 4,157	$ 5,269
Accrued compensation and benefits	3,919	9,135
Accrued rent obligations	2,227	1,787
Accrued legal contingency	1,586	3,174
Accrued manufacturing expenses	1,434	1,107
Other	3,155	2,823
Total accrued expenses	$ 16,478	$ 23,295