Employee Benefit Plans	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Note 9. Employee Benefit Plans The Company maintains defined contribution benefit plans under Section 401(k) of the Internal Revenue Code covering substantially all qualified employees of the Company (the “401(k) Plan”). Under the 401(k) Plan, the Company may make discretionary contributions of up to 100% of employee contributions. During the three months ended March 31, 2019 and 2018, the Company made contributions to the 401(k) Plan of $4 and $18, respectively.	Note 14. Employee Benefit Plans The Company maintains defined contribution benefit plans under Section 401(k) of the Internal Revenue Code covering substantially all qualified employees of the Company (the “401(k) Plan”). Under the 401(k) Plan, the Company may make discretionary contributions of up to 100% of employee contributions. During the year ended December 31, 2018 and 2017, the Company made contributions to the 401(k) Plan of $18 and $10, respectively.

The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans.

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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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