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Stockholders' Equity - Schedule of Warrants Outstanding (Details) shares in Thousands	Dec. 31, 2020 $ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 shares
Class Of Warrant Or Right [Line Items]
Number of Shares	375	375	75
Exercise Price | (per share)	$ 0.12	$ 0.15
Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	375	375
Common Stock Warrant One
Class Of Warrant Or Right [Line Items]
Number of Shares	33	33
Exercise Price | $ / shares	$ 47.00
Expiration	Jan. 31, 2023	Jan. 31, 2023
Common Stock Warrant Two
Class Of Warrant Or Right [Line Items]
Number of Shares	101	101
Exercise Price | $ / shares	$ 2.40
Expiration	Oct. 31, 2023	Oct. 31, 2023
2014 | Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	27	27
Exercise Price | $ / shares		$ 1.00
Expiration	Dec. 31, 2025	Dec. 31, 2025
2015 | Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	4	4
Exercise Price | $ / shares		$ 1.00
Expiration	Aug. 31, 2022	Aug. 31, 2022
2016 | Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	19	19
Exercise Price | $ / shares		$ 1.479
Expiration	Dec. 31, 2025	Dec. 31, 2025
2017 | Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	7	7
Exercise Price | $ / shares		$ 1.479
Expiration	Dec. 31, 2022	Dec. 31, 2022
2017 | Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	15	15
Exercise Price | $ / shares		$ 1.479
Expiration	Dec. 31, 2025	Dec. 31, 2025
2019 | Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	3	3
Exercise Price | $ / shares		$ 1.479
Expiration	Dec. 31, 2025	Dec. 31, 2025
2020 | Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	98	98
Exercise Price | $ / shares		$ 0.15
Expiration	Dec. 31, 2025	Dec. 31, 2025
2021 | Warrants
Class Of Warrant Or Right [Line Items]
Number of Shares	202	202
Exercise Price | $ / shares		$ 0.15
Expiration	Dec. 31, 2023	Dec. 31, 2023

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Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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