XML 25 R46.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Short Term Bank Deposits Bear Interest Average Rate 1.88% 2.37%    
Restricted Short Term Deposits $ 6,409 $ 7,374    
Long Term Bank Deposits Bear Interest Average Rate 2.16% 3.29%    
Restricted Long Term Deposits $ 600 $ 1,800    
Antidilutive Securities and Outstanding Options, RSUs and Warrants Excluded from Computation of Earings Per Share, Amount 48,491 158,823 317,186  
Severance Cost $ 2,324 $ 2,680 $ 2,631  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 6.63 $ 3.02 $ 3.05  
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 318 $ 308 $ 287  
Advertising Expense $ 669 627 442  
Defined Contribution Plan, Description All eligible employees may elect to contribute a portion of their annual compensation to the plan through salary deferrals, subject to the IRS limit of $19 during the years ended December 31, 2018 and 2019, plus a catch-up contribution of $6 for participants age 50 or over. The Group matches 50% of employees' contributions, up to a maximum of 6% of the employees' annual pay.      
Operating Lease, Right-of-Use Asset $ 29,688      
Operating Lease, Liability 31,676      
Investments in marketable securities 0      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
Costs and Expenses 38 242    
Other Receivables And Prepaid Expenses [Member]        
Contract with Customer, Asset, Net 460 422    
Grant [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 1,323 5,734 $ 8,290  
Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life 4 years 6 months      
Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life 10 years      
SEC Schedule, 12-09, Reserve, Warranty [Member]        
Valuation Allowances and Reserves, Balance $ 284 323    
Allowance For Sales Return [Member]        
Provision for Sales Return $ 1,885 $ 2,272    
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset       $ 33,122
Operating Lease, Liability       $ 33,122