Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2020 ft²	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Right-of-use asset obtained in exchange for operating lease liability	$ 300
Operating leases, rent expense		$ 3,600	$ 3,600
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Cumulative effect adjustment for adoption of ASU					$ 531
Accounting Standards Update 2016-02 | Retained Earnings
Lessee, Lease, Description [Line Items]
Cumulative effect adjustment for adoption of ASU					$ 531
Israel | Forecast
Lessee, Lease, Description [Line Items]
Area of land (in sq ft) | ft²				121,400
Buildings and Vehicles | Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term (years)	1 year
Buildings and Vehicles | Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term (years)	7 years