Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]      
Total deferred tax assets $ 15,150 $ 18,450  
Federal net operating losses 9,962 13,190  
Valuation allowance $ 4,701 $ 392  
U.S. statutory rate 21.00% 35.00% 35.00%
Domestic Tax Authority      
Income Tax Contingency [Line Items]      
Operating loss carryforwards $ 47,400    
State and Local Jurisdiction      
Income Tax Contingency [Line Items]      
Operating loss carryforwards $ 24,500