Correction to Previously Issued Consolidated Financial Statements - Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable	$ (4,047)	$ 5,964	$ (7,936)
Accounts payable and accrued expenses	$ (3,405)	1,641	2,825
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable		1,894	(8,008)
Accounts payable and accrued expenses		5,711	2,897
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable		4,070	72
Accounts payable and accrued expenses		$ (4,070)	$ (72)