Fair Value - Summary of Preferred Stock Warrant Liability (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value recorded in other expense	$ 1,800
Reclassification to additional paid-in capital upon the Merger	(1,909)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value at beginning of year	109
Issuances	0
Change in fair value recorded in other expense	1,800
Reclassification to additional paid-in capital upon the Merger	(1,909)
Fair value at end of year	$ 0