Organization and Basis of Presentation - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended		9 Months Ended	0 Months Ended	9 Months Ended
	Aug. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 2013 Equity Incentive Award Plan [Member]	Oct. 03, 2013 Subsequent Event [Member]	Sep. 30, 2013 Warrants for common stock [Member]	Sep. 30, 2013 Warrants for common stock [Member] Minimum [Member]	Sep. 30, 2013 Warrants for common stock [Member] Maximum [Member]	Sep. 30, 2013 Warrants for convertible preferred stock [Member]	Sep. 30, 2013 Executive Officer [Member]	Sep. 30, 2013 IPO [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Reverse stock split of issued and outstanding shares	One-for-five
Common stock shares sold											2,100,000
Common stock shares price per share					$ 12.00						$ 12.00
Conversion of convertible preferred stock		2,439,002
Retention bonus payable to executive officers		$ 355,000
Catch-up expense										202,857
Retention Bonus Agreement										Such amount will be recorded as expense on a straight-line basis from May 22, 2013 (the date of the retention agreements entered into with the executive officers) through December 24, 2013, the date at which the final payment is due based on continued employment.
Issuance of warrants to underwriter and certain affiliates						84,000
Warrants exercise price per share						21.00
Warrants exercisable start date							Sep. 24, 2014	Sep. 24, 2018
Warrant liability to additional paid-in capital						470,000			187,000		470,000
Conversion of Convertible Preferred warrant to warrant to purchase Common Stock									110,000
Conversion of convertible preferred warrants to purchase common stock									22,000
Common stock authorized		50,000,000	20,000,000
Preferred stock authorized		5,000,000	0
Shares of common stock available for issuance		30,000		510,000
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.		In addition, the number of shares of common stock available for issuance under the 2013 Plan will be annually increased on the first day of each fiscal year during the term of the 2013 Plan, beginning with the 2014 fiscal year, by an amount equal to the least of (i) 300,000 shares; (ii) four 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.
Employee common stock purchases through payroll deductions under employee stock purchase plan price as percentage of fair market value		20.00%
Additional common shares to be purchased by IPO underwriters under over-allotment option					315,000
Estimated net proceeds					3,440,400						21,675,682
Underwriting discounts and commissions and non-accountable expense allowance					264,600						2,080,275
Estimated total offering costs					$ 75,000						$ 1,444,043