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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 02, 2017 | May 28, 2014 | Jan. 31, 2011 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 28, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock outstanding |  |  |  | 3,555,000 | 3,975,000 |  |
Total intrinsic value of options exercised |  |  |  | $ 900,000 | $ 200,000 | $ 400,000 |
Total fair value of stock options vested |  |  |  | $ 13,000,000 | 12,100,000 | 6,900,000 |
Options and restricted stock units outstanding |  |  |  | 60,000 |  |  |
Expected dividend yield |  |  |  | 0.00% |  |  |
Cash-settled portion of stock compensation expense |  |  |  | $ 0 | $ 602,000 | $ 387,000 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock based compensation expense related to restricted stock |  |  |  | 5,500,000 |  |  |
Aggregate intrinsic value |  |  |  | $ 45,700,000 |  |  |
Grant date fair value of restricted stock |  |  |  | $ 5.34 | $ 12.42 | $ 20.05 |
Total fair value of restricted stock units |  |  |  | $ 1,200,000 | $ 1,000,000 | $ 100,000 |
Maximum | Employee Stock Option |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  |  | 10 years |  |  |
Options vesting period |  |  |  | 4 years |  |  |
Minimum | Employee Stock Option |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  |  | 7 years |  |  |
Options vesting period |  |  |  | 3 years |  |  |
2004 Stock Incentive Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock outstanding |  |  |  | 77,774 |  |  |
2010 Employment Inducement Award Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock outstanding |  |  |  | 11,450 |  |  |
2011 Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock outstanding |  |  |  | 3,373,555 |  |  |
Shares reserved and approved for issuance |  |  |  | 2,100,333 |  |  |
2011 Plan | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock shares | 10,343,442 |  |  |  |  |  |
Increase in the aggregate number of shares of common stock authorized for issuance | 1,600,000 |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |
2011 Plan | Minimum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  | 7 years |  |  |  |
2017 Inducement Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock shares reserved for future issuance |  |  |  | 1,125,200 |  |  | 1,200,000
Time Based Vesting Schedule |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  | $ 21,300,000 |  |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  | 1 year 8 months 12 days |  |  |
Performance Based Vesting Schedule |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  | $ 300,000 |  |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  | $ 400,000 |  |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  | 1 year 2 months 12 days |  |  |
Shares issued to employees |  |  |  | 84,247 |  |  |
Shares remaining available for future purchases |  |  |  | 98,227 |  |  |
2014 Employee Stock Purchase Plan | The commencement of the offer period (generally, the sixteenth day in February or August) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  | 85.00% |  |  |  |  |
2014 Employee Stock Purchase Plan | The exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  | 85.00% |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -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 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 Number of share instruments newly issued under a share-based compensation 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 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 2: 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 Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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