Stockholders' Equity and Stock-Based Compensation - Additional Information (Details) - USD ($)		1 Months Ended		6 Months Ended	12 Months Ended
	Apr. 27, 2016	May 31, 2016	Jan. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, authorized				200,000,000
Common stock, Issued				27,971,603
Common stock, outstanding				27,971,603
Dividends paid or declared				$ 0
Common stock voting rights				Each share of common stock has the right to one vote on all matters submitted to a vote of stockholders.
Retirement of treasury stock, Shares	1,128,472
Options outstanding				3,556,000	4,101,000
Unrecognized stock-based compensation costs related to non-vested awards				$ 19,394,000	$ 9,721,000
Weighted-average period for unrecognized compensation cost expected to be recognized				3 years 2 months 12 days	3 years
2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in share reserve under the plan			1,225,795
Shares available for future grants				1,968,280
2010 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding				3,324,506
2015 ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in share reserve under the plan			272,399
Shares available for future grants				449,263
Initial offering expiration period				27 months
Percentage of discount through payroll deductions to eligible employees to purchase common stock				15.00%
Common stock issued under ESPP		156,469
Stock price per share under ESPP		$ 13.60
Cash proceeds from issuance of common stock under ESPP		$ 2,128,000
Unrecognized stock-based compensation costs				$ 702,000	$ 919,000
Weighted average date for unrecognized compensation cost to expected to be recognized				Nov. 30, 2016	May 31, 2016