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Stock-based Compensation - Options (Details) - Options - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Mar. 29, 2018
Number of options outstanding [Roll Forward] |  |  |  |
Options outstanding, beginning of period (in shares) | 2,666,000 |  |  |
Granted (in shares) | 0 | 60,000 |  |
Exercised (in shares) | (22,000) |  |  |
Options outstanding, end of period (in shares) | 2,644,000 |  | 2,666,000 |
Options vested and unvested options expected to vest, net of forfeitures, end of period (in shares) | 2,616,000 |  |  |
Options exercisable, end of period (in shares) | 1,694,000 |  |  |
Weighted average exercise price [Roll Forward] |  |  |  |
Options outstanding, beginning of period (in dollars per share) | $ 3.81 |  |  |
Exercised (in dollars per share) | 2.94 |  |  |
Options outstanding, end of period (in dollars per share) | 3.81 |  | $ 3.81 |
Options vested and unvested options expected to vest, net of forfeitures (in dollars per share) | 3.79 |  |  |
Options exercisable, end of period (in dollars per share) | $ 3.41 |  |  |
Weighted-average grant date fair value of stock options granted (in dollars per share) |  | $ 2.76 |  |
Weighted average Remaining Contractual Life [Abstract] |  |  |  |
Options outstanding | 6 years 7 months 28 days |  | 6 years 10 months 13 days |
Options vested and unvested options expected to vest, net of forfeitures, end of period | 6 years 7 months 21 days |  |  |
Option exercisable, end of period | 5 years 9 months 22 days |  |  |
Aggregate Intrinsic Value [Abstract] |  |  |  |
Options outstanding, beginning of period | $ 13,149 |  |  |
Exercised | 97 |  |  |
Options outstanding, end of period | 9,409 |  | $ 13,149 |
Options vested and expected to vest, end of period | 9,352 |  |  |
Options exercisable, end of period | $ 6,523 |  |  |
Closing price (in dollars per share) |  |  |  | $ 7.25

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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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + 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=6415400&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://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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