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Number of share warrants exercised during the current period.

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Number of warrants or rights outstanding.

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The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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Stock Based Compensation - Alize Acquisition (Details) - $ / shares	3 Months Ended
	Mar. 31, 2020	Dec. 19, 2017
BSA and BSPCE warrants
Class of Warrant or Right [Line Items]
BSA and BSPCE warrants forfeited (in shares)	1,836
BSPCE warrants
Class of Warrant or Right [Line Items]
BSPCE warrants exercised (in shares)	910
Common Stock
Class of Warrant or Right [Line Items]
Exercise of BSPCE warrants (in shares)	12,307
Alize \| BSA and BSPCE warrants
Class of Warrant or Right [Line Items]
Weighted average exercise prices (in dollars per share)	$ 7.02
Number of shares issuable upon the exercise of the warrants (in shares)	58,415
Alize \| BSA and BSPCE warrants \| BSA warrants
Class of Warrant or Right [Line Items]
Common stock warrants outstanding (in shares)		6,219
Weighted average exercise prices (in dollars per share)		$ 80.06
Alize \| BSA and BSPCE warrants \| BSPCE warrants
Class of Warrant or Right [Line Items]
Common stock warrants outstanding (in shares)		5,360
Weighted average exercise prices (in dollars per share)		$ 83.40