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Warrants to Purchase Common or Preferred Stock - Narrative (Details) - shares	1 Months Ended
	Sep. 30, 2019	Sep. 30, 2017
Temporary Equity [Line Items]
Number of common shares called upon exercise of warrants	512,363
Number of warrants exercised	569,184
Number of warrants unexercised and terminated	9,054
Series F redeemable convertible preferred stock
Temporary Equity [Line Items]
Number of common shares called upon exercise of warrants		104,722
Series D and Series E redeemable convertible preferred stock
Temporary Equity [Line Items]
Number of common shares called upon exercise of warrants	119,771
Net exercise of common stock warrants (in shares)	27,431