Revenue from Contracts with Clients (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Nov. 19, 2018
Revenue from Contracts with Clients
Accounts receivable credit period	30 days
Allowance for doubtful receivables	$ 0	$ 0
Contract with Customer, Asset and Liability [Abstract]
Trade receivables, net	28,926	$ 40,144
Current contract liabilities (deferred revenue)	$ 7,567		$ 16,246

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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