Stock-Based Compensation - Employees and Non-Employees Related to Options and RSAs Recognized (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Selling, General and Administrative Expenses [Member]	Jun. 30, 2014 Selling, General and Administrative Expenses [Member]
Operating expenses
Selling, general and administrative	$ 1,861,654	$ 0	$ 865,922	$ 1,861,654