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Stockholders' Equity - Common Stock are Reserved for Future Issuance (Details) - shares shares in Thousands	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Warrants outstanding (in shares)	17,698	963
Stock options outstanding (in shares)	395	10
Options reserved for future issuance under the Company's 2017 Incentive Plan (in shares)	421
Shares reserved for future issuance under the Employee Stock Purchase Plan (in shares)	115
Restricted stock units (in shares)	13
Total reserved for future issuance (in shares)	18,642

X

- Definition

Common Stock Capital Shares Reserved For Future Issuance Of Employee Stock Purchase Plan

+ References

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X

- Definition

Options reserved for future issuance under the Company's 2007 Incentive Plan.

+ References

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- Definition

Restricted Stock, Shares Reserved for Future Issuance

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- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

+ 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
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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