Equity Incentive Plans - Summary of Activity Related to Outstanding Stock Options (Details)	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Service Period Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding Beginning Balance | shares	2,030,266
Shares, Granted | shares	95,364
Shares, Exercised | shares	(6,696)
Shares, Outstanding Ending Balance | shares	2,118,934
Weighted Average Exercise Price, Outstanding Beginning Balance | $ / shares	$ 9.47
Weighted Average Exercise Price, Granted | $ / shares	16.45
Weighted Average Exercise Price, Exercised | $ / shares	8.04
Weighted Average Exercise Price, Outstanding Ending Balance | $ / shares	$ 9.79
Performance-Vested Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding Beginning Balance | shares	1,154,393
Shares, Granted | shares	21,455
Shares, Outstanding Ending Balance | shares	1,175,848
Weighted Average Exercise Price, Outstanding Beginning Balance | $ / shares	$ 10.50
Weighted Average Exercise Price, Granted | $ / shares	16.45
Weighted Average Exercise Price, Outstanding Ending Balance | $ / shares	$ 10.61
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding Beginning Balance | shares	165,240
Shares, Granted | shares	106,887
Shares, Outstanding Ending Balance | shares	272,127
Weighted-Average Grant-Date Fair Value Per Unit, Outstanding Beginning Balance | $ / shares	$ 10.99
Weighted-Average Grant-Date Fair Value Per Unit, Granted | $ / shares	16.45
Weighted-Average Grant-Date Fair Value Per Unit, Outstanding Ending Balance | $ / shares	$ 13.13