Revenue Recognition - Contract Balances with Contract Customers (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts receivable, net	$ 0	$ 1,079
Deferred revenue	0	21
Contract liabilities	8,699	9,755
Other current assets	301	729
Other current liabilities	0	83
Contracts with Customers
Accounts receivable, net	0	1,079
Accrued liabilities	159	432
Deferred revenue	0	21
Contract liabilities	$ 8,699	$ 9,755

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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