Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Description of Company (Details)

v3.8.0.1
Basis of Presentation and Description of Company (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Oct. 01, 2016
USD ($)
Sep. 30, 2017
USD ($)
Oct. 01, 2016
USD ($)
Dec. 31, 2016
USD ($)
segment
Accounting Policies [Abstract]          
Net income $ 919 $ (360) $ 28,094 $ 1,311  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Reportable operating segments | segment         2
Retained earnings | Accounting Standards Update 2016-09          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of new accounting principle         $ (249)
Additional paid-in capital | Accounting Standards Update 2016-09          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of new accounting principle         $ 249