Stock-Based Compensation - Additional Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value			$ 8.60	$ 1.80
Options granted	0	0	46,875
Maximum contribution of base compensation for employee stock purchase plan			15.00%
Offering period of employee stock purchase plan			6 months
Purchase price of common stock percentage of fair market value			85.00%
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	1,200,000		1,200,000
Initial offering period			initial offering period which commenced in March 2014 and ends in November 2014.
2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	4,000,000		4,000,000
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of service condition and liquidity event condition			25.00%
Fair value of shares vested, total	$ 854,000	$ 1,404,000	$ 1,859,000	$ 2,988,000
Unrecognized stock based compensation, net of forfeitures	10,028,000		10,028,000
Unrecognized stock based compensation, amortized weighted average period			3 years 6 months
Stock Based Compensation Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation, net of forfeitures	59,263,000		59,263,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock based compensation, net of forfeitures	$ 49,235,000		$ 49,235,000
Unrecognized stock based compensation, amortized weighted average period			2 years 8 months 12 days