Stock-Based Compensation - Additional Information (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended					0 Months Ended	3 Months Ended		9 Months Ended			0 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Employee Separation Agreement	Sep. 30, 2014 Employees	Sep. 30, 2014 Director	Sep. 30, 2014 Shares available under all equity award plans for future issuance	Dec. 31, 2013 Shares available under all equity award plans for future issuance	Dec. 23, 2013 Restricted Stock	Sep. 30, 2014 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2014 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2014 Restricted Stock Former Employee	Dec. 23, 2013 Restricted Stock Employees	Dec. 23, 2013 Restricted Stock Non-Employees	Sep. 30, 2014 Stock Options	Sep. 30, 2013 Stock Options	Sep. 30, 2014 Stock Options	Sep. 30, 2013 Stock Options	Sep. 30, 2014 Maximum Stock Options	Sep. 30, 2014 Maximum Stock Options Director	Sep. 30, 2014 Maximum Non Employee Stock Options	Sep. 30, 2014 Minimum Stock Options	Sep. 30, 2014 Minimum Stock Options Director	Sep. 30, 2014 Minimum Non Employee Stock Options	Sep. 30, 2014 2014 Incentive Plan	Sep. 30, 2014 2014 Incentive Plan Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares reserved for future issuance	3,151,792		3,151,792		13,628,787				1,555,254	155,108																			1,785,000	1,980,890
Incremental rate at which the shares reserved for issuance increase																													3.00%
Granted shares							398,189	77,525
Granted shares of restricted stock																56,000	450,224	79,067
Vesting periods																							48 months	48 months	48 months	12 months	12 months	12 months
Stock-based compensation description																					For employees with less than one year’s worth of service, options vest in installments of (i) 25% at the one year anniversary and (ii) in either 36 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 granted to other employees vest in 48 equal monthly installments 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
Grant date fair value per share											$ 7.42
Restricted stock requisite service period description														The awards of restricted stock contain 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.
Stock based compensation expense	$ 1,234,756	$ 330,259	$ 5,123,564	$ 438,052		$ 1,000,000						$ 680,725	$ 312,717	$ 3,793,849	$ 399,885				$ 554,031	$ 17,542	$ 1,329,715	$ 38,167