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Stock-based Compensation - Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Options [Roll Forward]
Balance as of December 31, 2019 (in share) | shares	1,865
Granted (in share) | shares	86,000
Cancelled/forfeited (in share) | shares	(124)
Balance as of March 31, 2019 (in share) | shares	87,741
Vested as of March 31, 2020 | shares	1,080
Vested and expected to be vested as of March 31, 2020 | shares	87,741
Weighted Average Exercise Price [Roll Forward]
Balance as of December 31, 2019 (in dollars per share) | $ / shares	$ 2,968.22
Granted (in dollars per share) | $ / shares	2.18
Cancelled/forfeited (in dollars per share) | $ / shares	49,903.00
Balance as of March 31, 2020 (in dollars per share) | $ / shares	51.44
Vested as of March 31, 2020 | $ / shares	3,862.00
Vested and expected to be vested as of March 31, 2020 | $ / shares	$ 51.44

X

- Definition

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.

+ 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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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

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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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. 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 exercise price, at which grantee can acquire shares reserved for issuance, for 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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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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