Deferred Revenue - Summary of Deferred Revenue, Current Portion (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current portion	$ 10,217	$ 1,563
Total deferred revenue, net of current portion	4,243	4,585
Customer Prepayments [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current portion	8,680	1,563
Total deferred revenue, net of current portion	4,243	4,585
Minimum Commitment Fees [Member]
Deferred Revenue Arrangement [Line Items]
Total deferred revenue, current portion	1,537
Total deferred revenue, net of current portion