Annual report pursuant to Section 13 and 15(d)

Income Tax - Additional Information (Details)

v3.19.1
Income Tax - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]      
NOL carryforwards $ 0 $ 12,700,000 $ 26,100,000
Change in valuation allowance (73,000) (14,037,000) $ 138,000
Provisional income tax expense 2,800,000 2,800,000  
Foreign      
Operating Loss Carryforwards [Line Items]      
NOL carryforwards $ 2,300,000 $ 2,000,000