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Employee Benefit Plans and Stock-based Compensation - Options Excerise prices (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding, shares (in shares) | shares | 2,666
Weighted-average Exercise Price (in dollars per share) | $ 3.81
Weighted-average Remaining Contractual Life | 6 years 10 months 13 days
Options Vested and Exercisable Shares (in shares) | shares | 1,580
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 3.37
$2.04 - $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) | 2.04
Range of exercise price, maximum (in dollars per share) | $ 2.14
Options outstanding, shares (in shares) | shares | 36
Weighted-average Exercise Price (in dollars per share) | $ 2.10
Weighted-average Remaining Contractual Life | 4 years 5 months 19 days
Options Vested and Exercisable Shares (in shares) | shares | 31
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 2.09
$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 | 634
Weighted-average Exercise Price (in dollars per share) | $ 2.18
Weighted-average Remaining Contractual Life | 7 years 9 months 15 days
Options Vested and Exercisable Shares (in shares) | shares | 262
Option 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 | 401
Weighted-average Exercise Price (in dollars per share) | $ 2.33
Weighted-average Remaining Contractual Life | 6 years 18 days
Options Vested and Exercisable Shares (in shares) | shares | 376
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 2.33
$2.47 - $2.51 |
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) | $ 2.51
Options outstanding, shares (in shares) | shares | 284
Weighted-average Exercise Price (in dollars per share) | $ 2.47
Weighted-average Remaining Contractual Life | 6 years 9 months 11 days
Options Vested and Exercisable Shares (in shares) | shares | 201
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 2.47
$2.56 - $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) | 2.56
Range of exercise price, maximum (in dollars per share) | $ 4.79
Options outstanding, shares (in shares) | shares | 366
Weighted-average Exercise Price (in dollars per share) | $ 3.55
Weighted-average Remaining Contractual Life | 4 years 11 months 9 days
Options Vested and Exercisable Shares (in shares) | shares | 332
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 3.65
$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 | 518
Weighted-average Exercise Price (in dollars per share) | $ 5.21
Weighted-average Remaining Contractual Life | 8 years 9 months
Options Vested and Exercisable Shares (in shares) | shares | 135
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 5.21
$5.61 - $5.83 |
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) | $ 5.83
Options outstanding, shares (in shares) | shares | 242
Weighted-average Exercise Price (in dollars per share) | $ 5.76
Weighted-average Remaining Contractual Life | 3 years 1 month 10 days
Options Vested and Exercisable Shares (in shares) | shares | 242
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 5.76
$7.82 - $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) | 7.82
Range of exercise price, maximum (in dollars per share) | $ 7.82
Options outstanding, shares (in shares) | shares | 1
Weighted-average Exercise Price (in dollars per share) | $ 7.82
Weighted-average Remaining Contractual Life | 2 years 10 months 2 days
Options Vested and Exercisable Shares (in shares) | shares | 1
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ 7.82
$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 | 9 years 29 days
$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 | 9 years 9 months 26 days

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&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://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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&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://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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