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Other Current Assets
 9 Months Ended
Sep. 30, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Current Assets Other Current Assets
The following table shows the breakdown in other current assets net book value for the presented periods:
December 31, 2019September 30, 2020
(in thousands)
Prepayments to suppliers$5,109 $5,168 
Other debtors4,225 4,538 
Prepaid expenses7,891 9,572 
Gross book value at end of period17,225 19,278 
Net book value at end of period$17,225 $19,278 

Prepaid expenses mainly consist of office rental advance payments.