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Stockholders' Equity (Details)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Warrants issued to purchase redeemable convertible preferred stock	436,581
Number of warrants exercised	24,692
Number of common shares to be called upon exercise of warrants	22,366
Warrant expiration January 19, 2026
Subsidiary, Sale of Stock [Line Items]
Warrants issued to purchase redeemable convertible preferred stock	259,975
Exercise Price | $ / shares	$ 1.84
Warrant expiration March 31, 2026
Subsidiary, Sale of Stock [Line Items]
Warrants issued to purchase redeemable convertible preferred stock	71,753
Exercise Price | $ / shares	$ 1.84
Warrant expiration April 1, 2026
Subsidiary, Sale of Stock [Line Items]
Warrants issued to purchase redeemable convertible preferred stock	131
Exercise Price | $ / shares	$ 1.84
Warrant expiration September 8, 2024
Subsidiary, Sale of Stock [Line Items]
Warrants issued to purchase redeemable convertible preferred stock	83,778
Exercise Price | $ / shares	$ 14.32
Warrant expiration December 7, 2025
Subsidiary, Sale of Stock [Line Items]
Warrants issued to purchase redeemable convertible preferred stock	20,944
Exercise Price | $ / shares	$ 14.32

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+ References

No definition available.

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- Definition

Exercise price per share or per unit 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)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ 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
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 235
-SubTopic 10
-Section S99
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