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Stock-Based Compensation - Summary of Changes in Unvested Restricted Stock Units (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Restricted stock units vest and convert into shares of our common stock	4 years
Restricted stock units vested description after specified period	25

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- Definition

Restricted Stock Unit Conversion Into Shares Period

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- Definition

Restricted Stock Units Vested Description After Specified Period

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