Annual report pursuant to Section 13 and 15(d)

401 (K) Savings Plan (Details)

v3.19.1
401 (K) Savings Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit Sharing And Savings Plan [Abstract]      
Maximum employee contribution, percentage 100.00%    
Employer matching contributions $ 281 $ 343 $ 428