Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended	3 Months Ended		6 Months Ended				0 Months Ended	3 Months Ended		6 Months Ended		0 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Former Employee [Member]	Jun. 30, 2014 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]	Jun. 30, 2014 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]	Jun. 30, 2014 Stock Options [Member] Employees [Member]	Jun. 30, 2014 Stock Options [Member] Director [Member]	Dec. 23, 2013 Restricted Stock [Member]	Jun. 30, 2014 Restricted Stock [Member]	Jun. 30, 2013 Restricted Stock [Member]	Jun. 30, 2014 Restricted Stock [Member]	Jun. 30, 2013 Restricted Stock [Member]	Dec. 23, 2013 Restricted Stock [Member] Employees [Member]	Dec. 23, 2013 Restricted Stock [Member] Non-Employees [Member]	Jun. 30, 2014 Employee Separation Agreement [Member]	Jun. 30, 2014 Maximum [Member] Stock Options [Member]	Jun. 30, 2014 Minimum [Member] Stock Options [Member]	Jun. 30, 2014 2014 Incentive Plan [Member]	Jun. 30, 2014 2014 Incentive Plan [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for the issuance of awards	3,188,281		3,188,281		13,628,787																		1,785,000
Incremental rate at which the shares reserved for issuance increase																							3.00%
Maximum number of shares authorized to be issued under the plan																								1,980,890
Number of shares issued under all equity award plans			3,188,281
Number of shares available for future grants	1,801,201		1,801,201
Number of installments for vested shares																					48 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), 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), subject to the employee’s continuous service with the Company.
Options expiration after the date of grant									10 years
Grant date fair value restricted stock																		450,224	79,067
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.
Granted shares											179,689	47,525
Granted shares of restricted stock						56,000
Stock based compensation expense	$ 1,443,944	$ 51,401	$ 3,888,808	$ 107,793			$ 491,204	$ 7,319	$ 775,684	$ 20,625				$ 952,740	$ 44,082	$ 3,113,124	$ 87,168			$ 1,000,000