Commitments and Contingencies - Minimum Future Rentals Under Non-Cancelable Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
2014, Operating Leases	$ 1,490
2015, Operating Leases	1,501
2016, Operating Leases	1,516
2017, Operating Leases	1,519
2018, Operating Leases	1,527
2019 and beyond, Operating Leases	1,579
Total minimum lease payments, Operating Leases	9,132
2014, Capital Leases	253
2015, Capital Leases	439
2016, Capital Leases	448
2017, Capital Leases	457
2018, Capital Leases	466
2019 and beyond, Capital Leases	2,688
Total minimum lease payments, Capital Leases	4,751
Less amount representing interest	(700)
Present value of obligations under capital leases	$ 4,051