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Stock Incentive Plans - Schedule of Options Outstanding and Options Vested (Detail) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | $ 6.15 | $ 6.87 | $ 7.36 | $ 1.99
Options Outstanding, Number of Options Outstanding | 1,792,286 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (Years) | 7 years 6 months 4 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 6.14 |  |  |
Options Vested, Number of Options Vested | 990,371 |  |  |
Number of Options vested, Weighted Average Exercise Price | $ 6.05 |  |  |
$0.27-3.98 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options Outstanding | 448,109 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (Years) | 5 years 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 2.04 |  |  |
Options Vested, Number of Options Vested | 415,570 |  |  |
Number of Options vested, Weighted Average Exercise Price | $ 1.92 |  |  |
$0.27-3.98 [Member] | Minimum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | 0.27 |  |  |
$0.27-3.98 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | $ 3.98 |  |  |
$4.37 - 4.60 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options Outstanding | 179,263 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (Years) | 9 years 1 month 24 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 4.47 |  |  |
Options Vested, Number of Options Vested | 18,064 |  |  |
Number of Options vested, Weighted Average Exercise Price | $ 4.46 |  |  |
$4.37 - 4.60 [Member] | Minimum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | 4.37 |  |  |
$4.37 - 4.60 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | $ 4.60 |  |  |
$4.95 - 5.85 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options Outstanding | 397,018 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (Years) | 9 years 1 month 2 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 5.22 |  |  |
Options Vested, Number of Options Vested | 88,627 |  |  |
Number of Options vested, Weighted Average Exercise Price | $ 5.31 |  |  |
$4.95 - 5.85 [Member] | Minimum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | 4.95 |  |  |
$4.95 - 5.85 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | $ 5.85 |  |  |
$6.49 - 7.03 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options Outstanding | 384,910 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (Years) | 8 years 2 months 5 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 6.64 |  |  |
Options Vested, Number of Options Vested | 189,136 |  |  |
Number of Options vested, Weighted Average Exercise Price | $ 6.64 |  |  |
$6.49 - 7.03 [Member] | Minimum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | 6.49 |  |  |
$6.49 - 7.03 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | $ 7.03 |  |  |
$10.00 - 12.44 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Options Outstanding | 382,986 |  |  |
Options Outstanding, Weighted Average Remaining Contractual Life (Years) | 7 years 3 months 26 days |  |  |
Options Outstanding, Weighted Average Exercise Price | $ 12.20 |  |  |
Options Vested, Number of Options Vested | 278,974 |  |  |
Number of Options vested, Weighted Average Exercise Price | $ 12.14 |  |  |
$10.00 - 12.44 [Member] | Minimum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | 10.00 |  |  |
$10.00 - 12.44 [Member] | Maximum [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Range of Exercise Prices | $ 12.44 |  |  |

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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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