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Employee Benefit Plans and Stock-based Compensation - Options Excerise prices (Details) shares in Thousands	12 Months Ended
	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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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

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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

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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

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
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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

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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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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