Stock-Based Awards - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
|
12 Months Ended |
Jan. 01, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Options granted to purchase shares of common stock |
|
680,231
|
|
|
| Unvested service-based stock options held by nonemployees |
|
6,195
|
|
|
| Aggregate intrinsic value of stock options exercised |
|
$ 3,192
|
$ 323
|
$ 38
|
| Weighted average fair value of stock option granted |
|
$ 18.12
|
$ 6.55
|
$ 1.51
|
| Unrecognized stock-based compensation cost |
|
$ 11,325
|
|
|
| Weighted average period of unrecognized stock-based compensation cost expected to be recognized |
|
2 years 9 months 18 days
|
|
|
| Restricted Common Stock [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Aggregate intrinsic value of restricted stock award vested |
|
$ 265
|
$ 1,142
|
$ 278
|
| Common Stock [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Issuance of common stock in connection with employee stock purchase plan, shares |
|
20,916
|
5,395
|
|
| 2014 Stock Incentive Plan [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Options granted to purchase shares of common stock |
|
680,231
|
753,886
|
357,152
|
| 2014 Stock Incentive Plan [Member] | Maximum [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Stock options vesting period |
|
4 years
|
|
|
| 2014 Stock Incentive Plan [Member] | Minimum [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Stock options vesting period |
|
3 years
|
|
|
| 2014 Stock Incentive Plan [Member] | Common Stock [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Number of shares of common stock authorized for issuance |
2,126,907
|
|
1,336,907
|
|
| Number of shares of common stock available for issuance |
|
1,437,146
|
|
|
| Increased number of shares of common stock reserved for issuance |
1,659,218
|
|
|
|
| Additional number of shares of common stock , percentage |
4.00%
|
|
|
|
| 2014 Employee Stock Purchase Plan [Member] | Common Stock [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
| Number of shares of common stock authorized for issuance |
232,402
|
232,402
|
207,402
|
|
| Number of shares of common stock available for issuance |
|
206,091
|
|
|
| Increased number of shares of common stock reserved for issuance |
207,402
|
|
|
|
| Additional number of shares of common stock , percentage |
0.50%
|
|
|
|
| Issuance of common stock in connection with employee stock purchase plan, shares |
|
20,916
|
5,395
|
|