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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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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

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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