Stock Based Compensation - Summary of Status of Non-vested Restricted Shares (Details) - $ / shares	3 Months Ended	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Number of RSUs, Unvested Beginning of period	2,260	3,578	3,578
Number of RSUs, Forfeited	(565)	(189)
Number of RSUs, Unvested End of period	1,695	3,389	2,260	3,578
Weighted Average Grant Date Fair Value, Unvested RSUs Beginning of period	$ 70.00	$ 70.00	$ 70.00
Weighted Average Grant Date Fair Value, Forfeited	70.00	70.00
Weighted Average Grant Date Fair Value, Unvested RSUs End of period	$ 70.00	$ 70.00	$ 70.00	$ 70.00
Restricted Stock Units [Member]
Number of RSUs, Unvested Beginning of period	112,978	178,897	178,897	8,649
Number of RSUs, Granted				304,064
Number of RSUs, Forfeited			(37,674)	(34,845)
Number of RSUs, Vested			(28,245)	(98,971)
Number of RSUs, Unvested End of period			112,978	178,897
Weighted Average Grant Date Fair Value, Unvested RSUs Beginning of period	$ 1.40	$ 1.40	$ 1.40	$ 43.71
Weighted Average Grant Date Fair Value, Granted				1.40
Weighted Average Grant Date Fair Value, Forfeited			1.40	5.72
Weighted Average Grant Date Fair Value, Vested			1.40	2.50
Weighted Average Grant Date Fair Value, Unvested RSUs End of period			$ 1.40	$ 1.40

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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