Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions				1 Months Ended	9 Months Ended	12 Months Ended
	Sep. 21, 2020 shares	Sep. 02, 2020 shares	Jun. 03, 2019 $ / shares shares	Jun. 30, 2019 shares	Sep. 30, 2020 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Aug. 06, 2020 $ / shares	Jan. 17, 2018 $ / shares
Class of Stock [Line Items]
Common stock, shares authorized (shares)					426,000,000
Preferred stock, shares authorized (shares)					1,000,000
Preferred stock, par value (USD per shares) | $ / shares					$ 0.0001
Shares subject to Earnout (shares)						6,847,836
Threshold number of trading days price must remain above trigger price					20 days
Trading period that price must remain above trigger price					30 days
Preferred stock, shares outstanding (shares)					0
Warrant Amendment
Class of Stock [Line Items]
Number of shares in valid tendering		20,048,251
Percentage of issued shares in valid tendering		99.70%
Number of remaining warrants outstanding	60,493
Ratio of warrants exchanged into common shares	0.198
Shares subject to $12.25 earn-out
Class of Stock [Line Items]
Business combination, earn out price (USD per share) | $ / shares			$ 12.25
Shares subject to $15.00 earn-out
Class of Stock [Line Items]
Business combination, earn out price (USD per share) | $ / shares			15.00
Shares subject to $12.50 earn-out
Class of Stock [Line Items]
Business combination, earn out price (USD per share) | $ / shares			$ 12.50
Class A
Class of Stock [Line Items]
Common stock, shares authorized (shares)					200,000,000	200,000,000
Common stock, par value (USD per share) | $ / shares					$ 0.0001	$ 0.0001
Convert Class B (shares)			6,663,953	6,663,953
Sale of stock, price per share | $ / shares						$ 6.50
Outstanding warrants converted into common stock | $ / shares								$ 0.198
Sale of stock, number of shares issued in transaction (shares)						16,923,077
Sale of stock, consideration received per transaction | $						$ 110.0
Sale of stock, consideration received per transaction | $						$ 107.7
Class A | Warrant Amendment
Class of Stock [Line Items]
Number of shares issued in valid tendering		4,410,587
Class of warrants or right exchange of warrants outstanding shares issued	11,977
Class A | Private Placement | Forward Purchase Warrants and Private Placement Warrants
Class of Stock [Line Items]
Common stock, par value (USD per share) | $ / shares							$ 0.0001
Sale of stock, price per share | $ / shares							$ 0.22
Class A | Shares subject to $12.25 earn-out
Class of Stock [Line Items]
Shares subject to Earnout (shares)			157,500
Business combination, earn out price (USD per share) | $ / shares			$ 12.25
Threshold number of trading days price must remain above trigger price			20 days
Trading period that price must remain above trigger price			30 days
Class A | Shares subject to $15.00 earn-out
Class of Stock [Line Items]
Shares subject to Earnout (shares)			2,940,336
Business combination, earn out price (USD per share) | $ / shares			$ 15.00
Threshold number of trading days price must remain above trigger price			20 days
Trading period that price must remain above trigger price			30 days
Class B
Class of Stock [Line Items]
Common stock, shares authorized (shares)					25,000,000
Common stock, par value (USD per share) | $ / shares					$ 0.0001
Class C
Class of Stock [Line Items]
Common stock, shares authorized (shares)					200,000,000	200,000,000
Common stock, par value (USD per share) | $ / shares					$ 0.0001	$ 0.0001
Convert Class B (shares)			731,383	731,383
Ordinary Class B
Class of Stock [Line Items]
Shares canceled (shares)			3,854,664	3,854,664
Convert Class B (shares)			(7,395,336)	(7,395,336)
Common Class A (or, at each holder’s election, Class C ordinary shares) | Shares subject to $12.50 earn-out
Class of Stock [Line Items]
Shares subject to Earnout (shares)			3,750,000
Business combination, earn out price (USD per share) | $ / shares			$ 12.50
Threshold number of trading days price must remain above trigger price			20 days
Trading period that price must remain above trigger price			30 days