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Warrants to Purchase Convertible Preferred Stock - Summary of Activity for Convertible Preferred Stock Warrants (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2020 $ / shares shares
Series E Convertible Preferred Stock Warrants |
Class Of Warrant Or Right [Line Items] |
Outstanding - January 1, 2020, warrants | shares | 925
Forfeited/canceled, warrants | shares | (925)
Weighted average exercise price, Outstanding - January 1, 2020, warrants | $ / shares | $ 5.00
Weighted average exercise price, Forfeited/canceled, warrants | $ / shares | $ (5.00)
Series G Convertible Preferred Stock Warrants |
Class Of Warrant Or Right [Line Items] |
Outstanding - January 1, 2020, warrants | shares | 613
Reclassification of warrant liability to additional paid-in capital, warrants | shares | (613)
Weighted average exercise price, Outstanding - January 1, 2020, warrants | $ / shares | $ 0.75
Weighted average exercise price, Reclassification of warrant liability to additional paid-in capital, warrants | $ / shares | $ (0.75)

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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&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 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Increase (decrease) in the number of shares under non-option equity instrument agreements. + 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 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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