Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Cumulative Effect of ASU 2014-09 (Details)

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Summary of Significant Accounting Policies - Cumulative Effect of ASU 2014-09 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Balance Sheet        
Accounts receivable $ 2,550 $ 2,606    
Retained earnings 26,142 5,555    
Prepaid income taxes 5,429 0    
Income Statement        
Income tax provision (benefit) 8,052 (6,160) $ 3  
Net income (loss) 20,738 22,811 $ 350  
Accounting Standards Update 2014-09        
Balance Sheet        
Accounts receivable 2,550     $ 5,156
Retained earnings 26,142     8,105
Other assets, non-current 678      
Prepaid income taxes 5,429      
Income Statement        
Revenue 82,300      
Income tax provision (benefit) 8,052      
Net income (loss) 20,738      
Balance without adoption - ASC606 | Accounting Standards Update 2014-09        
Balance Sheet        
Accounts receivable 0 2,606    
Retained earnings 22,914 $ 5,555    
Other assets, non-current 0      
Prepaid income taxes 5,429      
Income Statement        
Revenue 82,300      
Income tax provision (benefit) 8,052      
Net income (loss) 20,738      
Effect of change | Accounting Standards Update 2014-09        
Balance Sheet        
Accounts receivable (2,550)     2,550
Retained earnings 3,228     $ 2,550
Other assets, non-current (678)      
Prepaid income taxes 0      
Income Statement        
Revenue 0      
Income tax provision (benefit) 0      
Net income (loss) $ 0