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Recently Adopted Accounting Pronouncements - Adoption of the new revenue standard Balance Sheet (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Prepaid expenses and other current assets $ 386 $ 216    
Accrued expenses 1,685 1,401    
Stockholders' equity $ 61,182 60,534    
Accounting Standards Update 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accounts receivable, net   1,400   $ 2,200
Deferred tax assets   (300)   (800)
Accrued expenses   200   300
Stockholders' equity   $ 900   $ 1,200
Accounting Standards Update 2014-09 | As Reported        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accounts receivable, net     $ 5,616  
Prepaid expenses and other current assets     315  
Deferred tax assets     5,648  
Accrued expenses     1,272  
Stockholders' equity     60,589  
Accounting Standards Update 2014-09 | New Revenue Standard Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accounts receivable, net     1,643  
Prepaid expenses and other current assets     14  
Deferred tax assets     (545)  
Accrued expenses     251  
Stockholders' equity     861  
Accounting Standards Update 2014-09 | As Adjusted        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accounts receivable, net     7,259  
Prepaid expenses and other current assets     329  
Deferred tax assets     5,103  
Accrued expenses     1,523  
Stockholders' equity     $ 61,450