Revenue - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)
Revenue From Contract With Customer [Abstract]
Contract acquisition cost recognition, description	most direct contract acquisition costs relate to contracts that are recognized over a period of one year or less.
Contract acquisition, capitalized cost	$ 0
Number of reportable segment | segment	2
Estimated contracted revenue	$ 100,300,000
Revenue, remaining performance obligation, expected timing of satisfaction, Description	Revenue allocated to remaining performance obligations represents estimated contracted revenue that has not yet been recognized which includes unearned revenue and amounts that will be invoiced and recognized as revenue in future periods. Estimated contracted revenue was $100.3 million as of March 31, 2019 of which we expect to recognize approximately 84% over the next 12 months and the remainder thereafter.
Revenue remaining performance obligation percentage of revenue expected to be recognized	84.00%
Contract with customer assets increase (decrease)	$ 1,600,000
Contract with customers assets increase decrease due to bill falls into subsequent period from one customer	1,800,000
Decrease in deferred revenue	(7,800,000)	$ (7,476,000)
Deferred revenue increase decrease due to revenue recognized upon customer acceptance	$ 5,000,000