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Stock Incentive Plans (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 01, 2018
Jul. 14, 2016
Aug. 27, 2015
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share-based compensation         $ 9,641 $ 8,754 $ 3,878
Cash received from stock options exercised         $ 1,322 169 1,792
Adjusted Options [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Maximum Number of Shares Authorized per One Participant         2,337,643    
Outstanding Stock Option, Modified Options, Decrease in Exercise Price   $ 1.71          
Adjusted option, Weighted Average Exercise Price         $ 7.04    
Modification of Original Options, Unvested, Number         1,908,070    
Modification Original Options, Unvested Options, Incremental Fair Value         $ 1,700    
Share-based compensation       $ 700      
Stock Options, Vested, Number         429,573    
Employee Stock Option [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         $ 16,100 $ 100 $ 1,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 7.30 $ 4.80
Stock Options Outstanding, Granted         0    
Cash received from stock options exercised         $ 1,300    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate           0.00%  
Stock Options, Unrecognized Share-based Compensation Expense         $ 7,100    
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition         2 years    
Performance Stock Units (PSUs) [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted Stock Units Outstanding, Granted         108,957 [1] 62,791 [1] 0
Stock Options, Unrecognized Share-based Compensation Expense         $ 3,000    
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition         2 years 6 months    
Restricted Stock Units (RSUs) [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Restricted Stock Units Outstanding, Granted         241,542   141,296
Stock Options, Unrecognized Share-based Compensation Expense         $ 3,400    
Share-based Compensation Expense Not yet Recognized, Weighted-average Period for Recognition         2 years    
2015 Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock Options Expiration Term     10 years        
Number of Shares Authorized     2,250,000        
Number of Shares Annual Increase 1,056,505   1,800,000        
Plan Shares Annual Increase, Percentage     4.00%        
Maximum Number of Shares Authorized per One Participant     2,000,000   870,689    
[1] The number of shares listed for PSUs granted during 2017 represents the actual number of PSUs granted to each recipient eligible to vest if the Company meets its performance goals for the applicable period. The number of shares listed for PSUs granted during 2018 represents the “target” number of PSUs granted to each recipient eligible to vest if the Company meets its “target” performance goals for the applicable period. The actual number of PSUs eligible to vest with respect to PSUs granted in 2018 will vary depending on whether or not the Company meets or exceeds the applicable threshold, target or maximum performance goals for the PSUs, with 200% of the “target” number of PSUs eligible to vest at “maximum” performance levels.