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Stockholders' Equity and Stock-based Compensation - Schedule of Stock Based Compensation Granted to Employees Directors Consultants (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stock based compensation related to equity instruments granted to related parties	$ 788	$ 751
Employees [Member] | Selling, General and Administrative [Member]
Stock based compensation related to equity instruments granted to related parties	638	593
Directors [Member] | Selling, General and Administrative [Member]
Stock based compensation related to equity instruments granted to related parties	75	50
Consultants [Member] | Selling, General and Administrative [Member]
Stock based compensation related to equity instruments granted to related parties	$ 75	$ 108

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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