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Employee Benefit Plans and Stock-Based Compensation - Options Exercise Prices (Details) shares in Thousands	12 Months Ended
	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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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.

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-Publisher FASB
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-Topic 718
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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.

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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.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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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.

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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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