Subsequent Events - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2019
Subsequent Event [Line Items]
Issuance of ordinary shares, net of issuance expenses			$ 161,974,000
Cowen and Company Limited Liability Company | ATM Sales Agreement
Subsequent Event [Line Items]
Issuance of ordinary shares, net of issuance expenses		$ 0
Subsequent Event | Cowen and Company Limited Liability Company | ATM Sales Agreement
Subsequent Event [Line Items]
Number of ordinary shares sold	700,000
Issuance of ordinary shares, net of issuance expenses	$ 16,600,000
Net proceeds from ordinary shares after deducting sales commissions	16,100,000
Remaining capacity	$ 83,400,000