Commitments, Rights of Use and Contingent Liabilities - Schedule of Future Minimum Lease Payments under Non-Cancelable Operating Lease (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Future minimum lease payments:
2019 (excluding the three months ended March 31, 2019)	$ 3,216
2020	3,766
2021	3,475
2022	2,503
2023	1,655
Thereafter	3,258
Total future minimum lease payments	17,873
Less imputed interest	(3,090)
Net present value of future minimum lease payments	14,783
Short-term lease liabilities	3,768
Long-term lease liabilities	11,015	$ 0
Net present value of future minimum lease payments	$ 14,783
Weighted average of remaining operating lease term	6 years 4 months 17 days
Weighted average of operating lease discount rate	7.46%