Subsequent Events - Additional Information (Detail)	12 Months Ended					1 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 First Model X Production Vehicle [Member]	Dec. 31, 2013 12-month period [Member] Vehicle	Dec. 31, 2013 First Gen III Production Vehicle [Member]	Dec. 31, 2013 Three Year Period [Member]	Jan. 31, 2014 Subsequent Event [Member] Tranches
Subsequent Event [Line Items]
Stock options granted to certain employees to purchase common stock						782,500
Number of vesting tranches						4
Portion of stock options scheduled to vest upon successful completion of performance objectives		0.25	0.25	0.25	0.25
Number of vehicle production			100,000
Gross margin	30.00%				30.00%