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Employee Benefit Plans and Stock-Based Compensation - Options Exercise Prices (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding, shares (in shares) | shares | 2,654
Weighted-average Exercise Price (in dollars per share) | $ 4.09
Weighted-average Remaining Contractual Life | 6 years 3 months 11 days
Options Vested and Exercisable, Shares (in shares) | shares | 1,863
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 3.60
$2.14 - $2.14 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 2.14
Range of exercise price, maximum (in dollars per share) | $ 2.14
Options outstanding, shares (in shares) | shares | 21
Weighted-average Exercise Price (in dollars per share) | $ 2.14
Weighted-average Remaining Contractual Life | 5 years 3 months 29 days
Options Vested and Exercisable, Shares (in shares) | shares | 21
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 2.14
$2.18 - $2.18 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 2.18
Range of exercise price, maximum (in dollars per share) | $ 2.18
Options outstanding, shares (in shares) | shares | 593
Weighted-average Exercise Price (in dollars per share) | $ 2.18
Weighted-average Remaining Contractual Life | 6 years 10 months 2 days
Options Vested and Exercisable, Shares (in shares) | shares | 420
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 2.18
$2.29 - $2.36 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 2.29
Range of exercise price, maximum (in dollars per share) | $ 2.36
Options outstanding, shares (in shares) | shares | 374
Weighted-average Exercise Price (in dollars per share) | $ 2.32
Weighted-average Remaining Contractual Life | 5 years 1 month 17 days
Options Vested and Exercisable, Shares (in shares) | shares | 374
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 2.32
$2.47 - $2.91 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 2.47
Range of exercise price, maximum (in dollars per share) | $ 2.91
Options outstanding, shares (in shares) | shares | 378
Weighted-average Exercise Price (in dollars per share) | $ 2.69
Weighted-average Remaining Contractual Life | 5 years 18 days
Options Vested and Exercisable, Shares (in shares) | shares | 360
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 2.69
$4.79 - $4.79 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 4.79
Range of exercise price, maximum (in dollars per share) | $ 4.79
Options outstanding, shares (in shares) | shares | 129
Weighted-average Exercise Price (in dollars per share) | $ 4.79
Weighted-average Remaining Contractual Life | 2 years 9 months 26 days
Options Vested and Exercisable, Shares (in shares) | shares | 129
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 4.79
$5.21 - $5.21 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 5.21
Range of exercise price, maximum (in dollars per share) | $ 5.21
Options outstanding, shares (in shares) | shares | 487
Weighted-average Exercise Price (in dollars per share) | $ 5.21
Weighted-average Remaining Contractual Life | 7 years 9 months 26 days
Options Vested and Exercisable, Shares (in shares) | shares | 251
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 5.21
$5.61 - $5.77 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 5.61
Range of exercise price, maximum (in dollars per share) | $ 5.77
Options outstanding, shares (in shares) | shares | 325
Weighted-average Exercise Price (in dollars per share) | $ 5.73
Weighted-average Remaining Contractual Life | 8 years 2 months 16 days
Options Vested and Exercisable, Shares (in shares) | shares | 80
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 5.61
$5.83 - $7.82 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 5.83
Range of exercise price, maximum (in dollars per share) | $ 7.82
Options outstanding, shares (in shares) | shares | 163
Weighted-average Exercise Price (in dollars per share) | $ 5.85
Weighted-average Remaining Contractual Life | 1 year 7 months 2 days
Options Vested and Exercisable, Shares (in shares) | shares | 163
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 5.85
$7.95 - $7.95 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 7.95
Range of exercise price, maximum (in dollars per share) | $ 7.95
Options outstanding, shares (in shares) | shares | 60
Weighted-average Exercise Price (in dollars per share) | $ 7.95
Weighted-average Remaining Contractual Life | 8 years 29 days
Options Vested and Exercisable, Shares (in shares) | shares | 29
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 7.95
$9.50 - $9.50 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Range of exercise price, minimum (in dollars per share) | 9.50
Range of exercise price, maximum (in dollars per share) | $ 9.50
Options outstanding, shares (in shares) | shares | 124
Weighted-average Exercise Price (in dollars per share) | $ 9.50
Weighted-average Remaining Contractual Life | 8 years 9 months 26 days
Options Vested and Exercisable, Shares (in shares) | shares | 36
Options Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 9.50

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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 floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and 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 -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 could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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