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Stock Incentive Plans - Summary of Option, Unvested RSU Activity and Related Information (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Available for Grant, Beginning Balance | 361,672 | 718,007 | 332,995
Shares Available for Grant, Additional options authorized | 512,575 | 357,075 | 940,884
Shares Available for Grant, Options granted | (597,470) | (652,078) | (585,345)
Shares Available for Grant, Assumed in business combination |  |  | 0
Shares Available for Grant, RSUs forfeited | 61,305 | 8,200 |
Shares Available for Grant, Options forfeited | 269,212 | 77,660 | 20,591
Shares Available for Grant, Options expired | 107,601 | 5,329 | 13,781
Shares Available for Grant, Ending Balance | 365,074 | 361,672 | 718,007
Number of Shares, Beginning Balance | 1,577,317 | 1,031,804 | 466,965
Number of Shares, Additional options authorized |  | 0 | 0
Number of Shares, Options granted | 597,470 | 652,078 | 585,345
Number of Shares, Assumed in business combination |  |  | 23,229
Number of Shares, Options exercised | (5,688) | (23,576) | (9,363)
Number of Shares, Options forfeited | (269,212) | (77,660) | (20,591)
Number of Shares, Options expired | (107,601) | (5,329) | (13,781)
Number of Shares, Ending Balance | 1,792,286 | 1,577,317 | 1,031,804
Number of Shares, Vested | 990,371 |  |
Number of Shares, Vested and expected to vest | 1,757,309 |  |
Weighted-Average Exercise Price, Beginning Balance | $ 6.87 | $ 7.36 | $ 1.99
Weighted-Average Exercise Price, Additional options authorized |  | 0 | 0
Weighted-Average Exercise Price, Options granted | 4.91 | 6.09 | 11.76
Weighted-Average Exercise Price, Assumed in business combination |  |  | 2.06
Weighted-Average Exercise Price, Options exercised | 3.29 | 1.94 | 2.14
Weighted-Average Exercise Price, Options forfeited | 6.64 | 8.13 | 10.36
Weighted-Average Exercise Price, Options expired | 8.88 | 10.36 | 2.74
Weighted-Average Exercise Price, Ending Balance | 6.15 | $ 6.87 | $ 7.36
Weighted-Average Exercise Price, Vested | 6.05 |  |
Weighted-Average Exercise Price, Vested and expected to vest | $ 6.15 |  |
Restricted Stock Grants [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares Available for Grant | (61,921) | (38,121) | (4,899)
Shares Available for Grant | 61,921 | 38,121 | 4,899
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of RSU Shares, Beginning Balance | 106,200 | 0 | 0
Shares Available for Grant | (287,900) | (114,400) |
Shares Available for Grant, RSUs forfeited | 61,305 | 8,200 |
Number of RSU Shares, vested | (26,550) |  |
Number of RSU Shares, Ending Balance | 306,245 | 106,200 | 0
Shares Available for Grant | 287,900 | 114,400 |
Weighted Average Grant- Date Fair Value, Unvested beginning balance | $ 6.49 | $ 0 | $ 0
Weighted- Average Grant Date Fair Value, RSUs granted | 5.50 | 6.49 |
Weighted- Average Grant Date Fair Value, RSUs forfeited | 5.81 | 6.49 |
Weighted- Average Grant Date Fair Value, RSUs vested | 6.49 |  |
Weighted Average Grant- Date Fair Value, Unvested ending balance | $ 5.69 | $ 6.49 | $ 0

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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