Stockholders' Equity - Summary of Warrant Activity (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Common Shares Issuable upon Exercise
Outstanding, beginning balance (in shares) | shares	0
Assumed in merger | shares	436,000
Issued (in shares) | shares	17,481,000
Exercised (in shares) | shares	(14,255,000)
Cancelled (in shares) | shares	0
Outstanding, ending balance (in shares) | shares	3,662,000
Exercisable at balance sheet date (in shares) | shares	1,425,000
Weighted Average Exercise Price
Outstanding, beginning balance (in usd per share) | $ / shares	$ 0
Assumed in merger (in usd per share) | $ / shares	20.59
Issued (in usd per share) | $ / shares	0.42
Exercised (in usd per share) | $ / shares	0.31
Cancelled (in usd per share) | $ / shares	0
Outstanding, ending balance (in usd per share) | $ / shares	3.79
Exercisable at balance sheet date (in dollars per share) | $ / shares	$ 6.95
Warrant Average Remaing Contractual Life
Warrants, outstanding, beginning	0 years
Warrants, outstanding, ending	4 years
Warrants exercisable	4 years 36 days