Stockholders' Equity - Additional Information (Details)					1 Months Ended		12 Months Ended
	Mar. 06, 2015 shares	Mar. 25, 2014 USD ($) shares	Mar. 06, 2014	Dec. 23, 2013 USD ($) $ / shares shares	Dec. 31, 2013 $ / shares shares	Sep. 30, 2013 $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) shares	Feb. 28, 2014 shares	Dec. 31, 2012 shares
Class of Stock [Line Items]
Common stock, shares authorized		175,000,000					175,000,000	175,000,000
Common stock, par value | $ / shares							$ 0.00001	$ 0.00001
Common stock, shares issued							30,662,218	20,370,624
Common stock, shares outstanding							30,662,218	20,370,624
Preferred stock, shares authorized		25,000,000					25,000,000	25,000,000
Preferred stock, par value | $ / shares							$ 0.00001	$ 0.00001
Preferred stock, shares issued							0	0
Preferred stock, shares outstanding							0	0
Stock split, conversion ratio			1.75
Convertible redeemable preferred stock converted into common stock		12,115,183						0
Common stock, shares reserved for future issuance							4,206,809	3,760,145
Compensation not yet recognized, stock options | $							$ 9,700,000
Weighted average period of recognition for unrecognized compensation costs							2 years 7 months 13 days
Stock-based compensation expense | $							$ 4,714,000	$ 6,010,000	$ 1,564,000
Employee Severance
Class of Stock [Line Items]
Stock-based compensation expense | $								$ 1,000,000
Common Stock
Class of Stock [Line Items]
Common stock, shares outstanding					1,383,345		30,662,218	20,370,624	1,383,345		615,757
Total compensation cost recognized | $									$ 1,100,000
Former Employees | Common Stock
Class of Stock [Line Items]
Granted, Shares					105,753	70,964
Granted, Weighted-Average Grant Date Fair Value | $ / shares					$ 7.42	$ 3.77
Restricted Stock Units
Class of Stock [Line Items]
Granted, Shares							27,875
Vesting periods							3 years
Weighted average period of recognition for unrecognized compensation costs							2 years 2 months 5 days
Granted, Weighted-Average Grant Date Fair Value | $ / shares							$ 11.15
Stock-based compensation expense | $							$ 62,000
Unrecognized compensation cost | $							200,000
Total compensation cost to be recognized | $							$ 300,000
Restricted Stock Units | Share Based Compensation Award Tranche One
Class of Stock [Line Items]
Vesting percentage							100.00%
Stock Options
Class of Stock [Line Items]
Shares issued	479,750
Stock-based compensation description							Options vest in installments of (i) 25% at the one year anniversary and (ii) in either 36 or 48 equal monthly or 12 equal quarterly installments beginning in the thirteenth month after the initial Vesting Commencement Date (as defined) or grant date, subject to the employee’s continuous service with the Company
Options expiration after the date of grant							10 years
Stock-based compensation expense | $							$ 3,660,000	$ 1,925,000
Stock Options | Share Based Compensation Award Tranche One
Class of Stock [Line Items]
Vesting percentage							25.00%
Restricted Stock
Class of Stock [Line Items]
Common stock, shares reserved for future issuance							216,716	422,145
Vesting periods				1 year
Weighted average period of recognition for unrecognized compensation costs							1 year 29 days
Granted, Weighted-Average Grant Date Fair Value | $ / shares				$ 7.42
Restricted stock requisite service period description							The awards of restricted stock contained a performance condition wherein vesting is contingent upon the Company’s consummation of a liquidity event, as defined, prior to the fifth anniversary of the date of grant. Certain of the awards of restricted stock have a requisite service period that was complete upon grant. The remainder of the awards of restricted stock have a requisite service period of four years whereby the award vests 25% on the one year anniversary of the Vesting Commencement Date (as defined), then ratably on the first day of each calendar quarter for 12 quarters, subject to continuous service by the individual and achievement of the performance target
Grant-date fair value of restricted stock issued | $				$ 3,900,000
Award requisite service period				4 years
Stock-based compensation expense | $		$ 100,000					$ 909,000	$ 4,085,000
Unrecognized compensation cost | $							$ 400,000
Restricted Stock | Share Based Compensation Award Tranche One
Class of Stock [Line Items]
Vesting percentage				25.00%
Restricted Stock | Employees
Class of Stock [Line Items]
Granted, Shares				450,224
Restricted Stock | Non Employees
Class of Stock [Line Items]
Granted, Shares				79,067
Maximum | Stock Options
Class of Stock [Line Items]
Vesting periods							48 months
Maximum | Stock Options | Director
Class of Stock [Line Items]
Vesting periods							48 months
Maximum | Non Employee Stock Option
Class of Stock [Line Items]
Vesting periods							48 months
Minimum | Stock Options
Class of Stock [Line Items]
Vesting periods							12 months
Minimum | Stock Options | Director
Class of Stock [Line Items]
Vesting periods							12 months
Minimum | Non Employee Stock Option
Class of Stock [Line Items]
Vesting periods							12 months
2014 Plans
Class of Stock [Line Items]
Common stock, shares reserved for future issuance							1,318,732	1,549,154		1,785,000
Incremental rate at which the shares reserved for issuance increase							3.00%
2014 Plans | Employees
Class of Stock [Line Items]
Granted, Shares							957,050
2014 Plans | Director
Class of Stock [Line Items]
Granted, Shares							35,000
2014 Plans | Restricted Stock Units
Class of Stock [Line Items]
Granted, Shares							27,875
2014 Plans | Maximum
Class of Stock [Line Items]
Common stock, shares reserved for future issuance							1,131,937
2014 Employee Stock Purchase Plan
Class of Stock [Line Items]
Maximum shares of common stock authorized to be issued							262,500
Percentage of increase on common stock authorized on each anniversary							1.00%
Number of common stock outstanding							739,611
Common stock shares authorized percentage under the plan							5.00%
Purchase price at the end of offering period							85.00%
Offering period							6 months
Shares issued							25,903
Stock-based compensation expense | $							$ 83,000