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Stock-based Compensation - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2017 | Feb. 28, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Apr. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 2,855 | $ 4,471 |
Stock Options [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of stock options granted to members of board of directors, executives, and non-executive employees |  |  |  | 1,023,222 |  |
Additional disclosures [Abstract] |  |  |  |  |  |
Minimum age required for employees to qualify for immediate vesting of RSUs |  |  |  | 55 years |  |
Threshold years required for retirement age |  |  |  | 70 years |  |
Stock Options [Member] | Non Executive Employee [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 4 years |  |
Stock Options [Member] | Directors [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |
Performance Shares [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 0 |  |
Additional disclosures [Abstract] |  |  |  |  |  |
Options granted |  |  |  | 412,500 |  |
Grant date fair value |  |  | $ 700 | $ 700 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Additional disclosures [Abstract] |  |  |  |  |  |
Minimum age required for employees to qualify for immediate vesting of RSUs |  |  |  | 55 years |  |
Threshold years required for retirement age |  |  |  | 70 years |  |
Restricted Stock Units (RSUs) [Member] | Non Executive Employee [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Restricted Stock Units (RSUs) [Member] | Directors [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |
2010 Plan [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of stock options granted to members of board of directors, executives, and non-executive employees | 998,000 | 1,018,000 |  |  |  |
Vesting period |  |  |  | 3 years |  |
2010 Plan [Member] | Options and Stock Appreciation Rights [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Increase in shares per person award limits | 2,000,000 |  |  |  |  |
2010 Plan [Member] | Other Types of Stock Awards [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Increase in shares per person award limits | 2,000,000 |  |  |  |  |
2010 Plan [Member] | Stock Options [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 200 |  |  |
2010 Plan [Member] | Common Stock [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Increase in aggregate number of shares authorized for issuance | 1,470,502 |  |  |  |  |
Shares authorized for issuance | 2,579,062 |  |  |  |  |
2010 Plan [Member] | Common Stock [Member] | Incentive Stock Options [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Increase in aggregate number of shares authorized for issuance | 2,004,087 |  |  |  |  |
Shares authorized for issuance | 2,579,062 |  |  |  |  |
2015 ESPP [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage related to employees to purchase shares at the lower fair market value at offering period |  |  |  | 85.00% |  |
2015 ESPP [Member] | Common Stock [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Increase in aggregate number of shares authorized for issuance | 250,000 |  |  |  |  |
Shares authorized for issuance | 265,000 |  |  |  |  | 15,000
Increase in shares per person award limits | 2,500 |  |  |  |  |

X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per 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 -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 Net number of share options (or share units) granted during the 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Minimum age required for employees to qualify for immediate vesting of RSUs. + References No definition available. + Details
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