Basis of Presentation and Summary of Significant Accounting Policies - Summary of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Contract assets:
Balance at beginning of period	$ 1,956	$ 739
Additions	10,029	7,117
Deductions	(10,319)	(5,900)
Balance at end of period	1,666	1,956
Contract liabilities:
Balance at beginning of period	1,280	100
Additions	3,032	4,428
Deductions	(3,137)	(3,248)
Balance at end of period	$ 1,175	$ 1,280