Convertible Preferred Stock, Common Stock and Stockholders' Equity (Deficit) - Stock-Based Compensation and Employee Stock Purchase Plan - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jun. 13, 2013 Employee Stock Purchase Plan [Member]	Dec. 31, 2013 Employee Stock Purchase Plan [Member]
Subsidiary, Sale of Stock [Line Items]
Unrecognized compensation costs	$ 3,055,000	$ 26,000
Weighted average period	1 year 10 months 2 days	2 years
Percentage of deduction of eligible compensation			20.00%
Shares of common stock available for issuance	1,069,250	2,576,252	30,000
Shares of common stock available for issuance description				In addition, the number of shares of common stock available for issuance under the ESPP will be annually increased on the first day of each fiscal year during the term of the ESPP, beginning with the 2014 fiscal year, by an amount equal to the least of (i) 30,000 shares; (ii) one percent of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year; or (iii) such other amount as the Company's board of directors may determine.
Reserve percentage for issuance of shares			1.00%
ESPP approval date			Aug. 29, 2013
Shares of common stock issued under ESPP				0