Basis of Presentation and Summary of Significant Accounting Policies - Summary of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Contract assets:
Balance at beginning of period	$ 1,666	$ 1,956
Additions	13,624	10,029
Deductions	(13,806)	(10,319)
Balance at end of period	1,484	1,666
Contract liabilities:
Balance at beginning of period	1,175	1,280
Additions	5,348	3,032
Deductions	(5,049)	(3,137)
Balance at end of period	$ 1,474	$ 1,175