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Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning balance (in shares)	10	395	395
Granted (in shares)		483
Canceled (in shares)		(98)
Options outstanding, ending balance (in shares)	10	395
Exercisable (in shares)			53
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning balance (usd per share)		$ 1,240.55
Weighted average exercise price, granted (usd per share)		5.24
Weighted average exercise price, canceled (use per share)		5.30
Weighted average exercise price, ending balance (usd per share)	$ 1,240.55	$ 37.09
Weighted average exercise price, exercisable (usd per share)			$ 241.17
Weighted average remaining contractual term, outstanding (in years)	1 year	9 years 4 days
Weighted average remaining contractual term, options exercisable (in years)		7 years 7 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Roll Forward]
Stock options activity, aggregate intrinsic value, beginning balance		$ 0
Stock options activity, aggregate intrinsic value, granted		0
Stock options activity, aggregate intrinsic value, canceled		0
Stock options activity, aggregate intrinsic value, ending balance	$ 0	$ 0
Stock options activity, aggregate intrinsic value, exercisable			$ 0

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Share Based Compensation Arrangement By Share Based Payment Award Options Expired In Period Intrinsic Value

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value

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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.

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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.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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