Annual report pursuant to Section 13 and 15(d)

Restructuring Charge (Details)

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Restructuring Charge (Details) - USD ($)
1 Months Ended 3 Months Ended
Nov. 29, 2018
Dec. 31, 2018
Employee Severance [Member]    
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent 33.00%  
One-time Termination Benefits [Member]    
Severance Costs   $ 409,000