Commitments and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Operating lease expiration description	The facilities of the Company are leased under various operating lease agreements for periods ending no later than 2024.
Lease and rental expense	$ 2,748	$ 2,194	$ 1,794
Pledged bank deposits	807	133
Operating Lease Commitments	$ 955	$ 283
Motor Vehicles
Loss Contingencies [Line Items]
Operating lease expiration description	The Company also leases motor vehicles under various operating leases, which expire on various dates, the latest of which is in 2019
Maximum
Loss Contingencies [Line Items]
Operating lease agreements, expiration year	2024
Maximum | Motor Vehicles
Loss Contingencies [Line Items]
Operating lease agreements, expiration year	2019