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Stock-Based Compensation - Summary of Option and RSU Activity (Details) - $ / shares | 3 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Number of Shares |  |  |  |
Options granted (in shares) | 0 |  |  |
Amended and Restated 2010 Equity Incentive Plan [Member] |  |  |  |
Shares Available for Grant |  |  |  |
Balance at the beginning of the year (in shares) | 392,000 | 183,000 |  |
Additional shares authorized |  |  | 50,000 |
Balance at the end of the year (in shares) | 81,000 | 392,000 | 183,000 |
Number of Shares |  |  |  |
Balance at the beginning of the period (in shares) | 336,000 | 508,000 |  |
Balance at the end of the period (in shares) | 248,000 | 336,000 | 508,000 |
Weighted Average Exercise Prices |  |  |  |
Weighted-average exercise price (in dollars per share) | $ 16.47 | $ 16.04 | $ 14.06 |
RSU's | Amended and Restated 2010 Equity Incentive Plan [Member] |  |  |  |
Shares Available for Grant |  |  |  |
Restricted stock units granted (in shares) | (407,000) |  |  |
Restricted stock units cancelled and returned to Plan (in shares) | 8,000 | 37,000 | 5,000 |
Options | Amended and Restated 2010 Equity Incentive Plan [Member] |  |  |  |
Shares Available for Grant |  |  |  |
Balance at the beginning of the year (in shares) |  |  | 114,000 |
Options granted (in shares) |  |  | (1,000) |
Options cancelled and returned to Plan (in shares) | 88,000 | 172,000 | 15,000 |
Number of Shares |  |  |  |
Balance at the beginning of the period (in shares) |  |  | 522,000 |
Options granted (in shares) |  |  | 1,000 |
Options cancelled and returned to Plan (in shares) | (88,000) | (172,000) | (15,000) |
Weighted Average Exercise Prices |  |  |  |
Weighted-average exercise price (in dollars per share) |  |  |  | $ 13.88
Options granted (in dollars per share) |  |  | $ 2.36 |
Options cancelled and returned to Plan (in dollars per share) | $ 14.83 | $ 10.20 | $ 6.94 |

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- Definition Represents the rollforward of Shares Available for Grant under the Plans. + References No definition available. + Details
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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 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 Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + 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 The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition 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 + Details
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