Nature of the Business and Basis of Presentation - Additional Information (Detail) - Common Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands |
|
|
1 Months Ended |
12 Months Ended |
Aug. 19, 2014 |
Jul. 30, 2014 |
Jun. 30, 2015 |
Aug. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Class of Stock [Line Items] |
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|
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| Number of shares issued |
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|
|
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3,200,000
|
5,750,000
|
100,378
|
| Number of common shares issued on conversion of redeemable convertible preferred stock |
|
|
|
|
|
12,440,205
|
|
| IPO [Member] |
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| Class of Stock [Line Items] |
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|
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| Number of shares issued |
|
5,000,000
|
|
|
|
|
|
| Common stock, price per share |
|
$ 13.00
|
|
|
|
|
|
| Proceeds from issuance of shares |
|
$ 57,337
|
|
|
|
|
|
| Number of common shares issued on conversion of redeemable convertible preferred stock |
|
12,440,205
|
|
|
|
|
|
| Over-allotment Option [Member] |
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|
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| Class of Stock [Line Items] |
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|
|
|
|
|
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| Number of shares issued |
750,000
|
|
|
750,000
|
|
|
|
| Common stock, price per share |
$ 13.00
|
|
|
$ 13.00
|
|
|
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| Proceeds from issuance of shares |
$ 9,068
|
|
|
$ 9,068
|
|
|
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| Follow-on Offering [Member] |
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|
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| Class of Stock [Line Items] |
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|
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|
|
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| Number of shares issued |
|
|
4,600,000
|
|
|
|
|
| Common stock, price per share |
|
|
$ 22.00
|
|
|
|
|
| Proceeds from issuance of shares |
|
|
$ 65,612
|
|
|
|
|
| Number of shares offered by company |
|
|
3,200,000
|
|
|
|
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| Number of shares offered by stockholders |
|
|
1,400,000
|
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