Description of Business and Summary of Significant Accounting Policies - Costs to Obtain and Fulfill a Contract (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Capitalized contract costs, net, current			$ 646	$ 734
Capitalized contract costs, net, noncurrent			985
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 1,630	$ 1,897	$ 1,630	$ 1,897	$ 2,238
Costs recognized from beginning balance	(743)	(708)
Additions, net of costs recognized	476	367
Balance, end of period	$ 1,630	$ 1,897