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Stock-Based Compensation - Options (Details) - Options - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Number of Options Outstanding [Roll Forward] |  |  |
Options outstanding, beginning of period (in shares) | 2,654,000 |  |
Granted (in shares) | 0 | 0 |
Options outstanding, end of period (in shares) | 2,654,000 |  | 2,654,000
Options vested and unvested options expected to vest, net of forfeitures, end of period (in shares) | 2,632,000 |  |
Options exercisable, end of period (in shares) | 1,956,000 |  |
Weighted-average Exercise Price [Roll Forward] |  |  |
Options outstanding, beginning of period (in dollars per share) | $ 4.09 |  |
Options outstanding, end of period (in dollars per share) | 4.09 |  | $ 4.09
Options vested and unvested options expected to vest, net of forfeitures (in dollars per share) | 4.07 |  |
Options exercisable, end of period (in dollars per share) | $ 3.62 |  |
Weighted average Remaining Contractual Life [Abstract] |  |  |
Options outstanding | 6 years 15 days |  | 6 years 3 months 11 days
Options vested and unvested options expected to vest, net of forfeitures, end of period | 6 years 4 days |  |
Option exercisable, end of period | 5 years 3 months 4 days |  |
Aggregate Intrinsic Value [Abstract] |  |  |
Options outstanding, beginning of period | $ 2,720 |  |
Options outstanding, end of period | 2,857 |  | $ 2,720
Options vested and expected to vest, end of period | 2,856 |  |
Options exercisable, end of period | $ 2,546 |  |
Closing price (in dollars per share) | $ 4.45 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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