Other Current Assets (Tables)

3 Months Ended

Mar. 31, 2020

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of other current assets net book value

The following table shows the breakdown in other current assets net book value for the presented periods:

	December 31, 2019		March 31, 2020
	(in thousands)
Prepayments to suppliers	$	5,109	$	4,668
Other debtors	4,225		3,822
Prepaid expenses	7,891		11,237
Derivative instruments	—		105
Gross book value at end of period	17,225		19,832
Net book value at end of period	$	17,225	$	19,832