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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 03, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2012
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Common stock, shares issued | 2,807,017 | 43,587,079 | 33,844,074 |  |
Common stock issue price per share | $ 42.75 |  |  |  |
Exercised number of shares |  | 215,495 |  |  |
Net proceeds from public offering | $ 129,309 | $ 129,309 |  |  |
Stock-based compensation expense |  | $ 6,747 | $ 4,595 | $ 3,598 |
Stock options, outstanding |  | 734,940 | 882,748 |  |
Number of shares available for future grant |  | 1,220,915 |  |  |
Closing price of common stock |  | $ 36.28 |  |  |
Aggregate intrinsic value of stock options exercised |  | $ 5,305 | $ 5,043 | $ 3,638 |
Weighted average grant date fair value of share-based awards granted |  | $ 16.94 | $ 14.16 | $ 16.05 |
Total fair value of stock options vested |  | $ 2,220 | $ 1,713 | $ 1,536 |
Total unrecognized compensation cost |  | $ 16,133 |  |  |
Unrecognized compensation cost, weighted average remaining requisite service period |  | 2 years 6 months 7 days |  |  |
Number of unvested options and restricted stock units |  | 772,791 |  |  |
Employee Stock Option | Minimum |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  |  |  |  | 3 years
Employee Stock Option | Minimum | Vest Over Three Year |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting percentage |  |  |  |  | 20.00%
Employee Stock Option | Maximum |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  |  |  |  | 5 years
Incentive options, term |  |  |  |  | 10 years
Employee Stock Option | Maximum | Vest Over Five Year |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting percentage |  |  |  |  | 33.00%
Non-Employee Directors |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  |  |  |  | 1 year
Option To Purchase Common Stock |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Stock options, outstanding |  | 734,940 | 1,236,586 | 1,240,935 |
Restricted Stock Units (RSUs) |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  | 5 years |  |  |
Restricted stock units, outstanding |  | 505,235 | 353,838 |  |
Closing price of common stock |  | $ 36.28 |  |  |
Aggregate intrinsic value of restricted stock units vested |  | $ 4,010 | $ 1,671 | $ 1,304 |
Weighted average grant date fair value of restricted stock units granted |  | $ 26.03 | $ 27.25 | $ 29.07 |
Total grant date fair value of restricted stock units vested |  | $ 4,010 | $ 1,474 | $ 781 |
Unvested Options |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting period |  | 5 years |  |  |
Underwriters | Common Stock |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Exercised number of shares | 421,052 |  |  |  |
Former president and chief executive officer | Employee Stock Option |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | $ 292 | $ 826 |
Former president and chief executive officer | Employee Stock Option | Vested as of April 2016 |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting percentage |  |  | 50.00% |  |
Former president and chief executive officer | Employee Stock Option | Vested as of January 2015 |  |  |  |  |
Stockholders Equity Note Disclosure [Line Items] |  |  |  |  |
Incentive options, vesting percentage |  |  |  | 50.00% |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=96867065&loc=d3e5070-113901 Reference 2: 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)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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