Quarterly report pursuant to Section 13 or 15(d)

Revenue - Schedule of Contract Assets and Liabilities (Details)

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Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jan. 02, 2018
Dec. 31, 2017
Account receivables, net of allowance $ 8,300 $ 7,940  
Unbilled receivables - current 3,389 4,547 $ 4,547
Unbilled receivables - non-current 184 184
Deferred revenue 5,872 $ 5,083 $ 4,311
Year-to-date Change [Member]      
Account receivables, net of allowance 360    
Unbilled receivables - current (1,158)    
Unbilled receivables - non-current (184)    
Deferred revenue $ 789    
Changes in Account receivables, net of allowance, percentage 4.50%    
Changes in Unbilled receivables - current, percentage (25.50%)    
Changes in Unbilled receivables - non-current, percentage (100.00%)    
Changes in Deferred revenue, percentage 15.50%