Basis of Presentation and Summary of Significant Accounting Policies - Summary of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Contract assets:
Beginning balance	$ 1,666	$ 1,956
Additions	4,090	10,029
Deductions	(3,976)	(10,319)
Ending balance	1,780	1,666
Contract liabilities:
Beginning balance	1,175	1,280
Additions	3,164	3,032
Deductions	(3,466)	(3,137)
Ending balance	873	$ 1,175
Amounts reclassified from unbilled revenue to accounts receivable	(4,000)
Amounts reclassified from deferred revenue to revenue	$ (3,500)