Revenues - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2018
Disaggregation of Revenue [Line Items]
Cumulative effect of new accounting principle in period of adoption			$ 268
Products and Services
Disaggregation of Revenue [Line Items]
Revenue recognized, percent	92.90%	95.00%
Product
Disaggregation of Revenue [Line Items]
Revenue recognized, percent	7.10%	5.00%
Retained Earnings
Disaggregation of Revenue [Line Items]
Cumulative effect of new accounting principle in period of adoption			268
Accounting Standards Update 2014-09 | Retained Earnings
Disaggregation of Revenue [Line Items]
Cumulative effect of new accounting principle in period of adoption			$ (300)