Revenue Recognition - Summary of the Adoption of ASC 606 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Statement of Financial Position [Abstract]
Inventories	$ 1,790	$ 1,285
Costs and estimated profit in excess of billings	0	565
Billings in excess of costs and estimated profit	0	983
Customer deposits	184	0	$ 982
Statement of Cash Flows [Abstract]
Inventories	(505)	119
Costs and estimated profit in excess of billings	565	480
Billings in excess of costs and estimated profit	(983)	331
Customer deposits	184	$ 0
Adjustments | Accounting Standards Update 2014-09
Statement of Financial Position [Abstract]
Inventories	(201)
Costs and estimated profit in excess of billings	186
Billings in excess of costs and estimated profit	972
Customer deposits	184
Statement of Cash Flows [Abstract]
Inventories	201
Costs and estimated profit in excess of billings	(186)
Billings in excess of costs and estimated profit	(972)
Customer deposits	184
Balances without adoption of ASC 606
Statement of Financial Position [Abstract]
Inventories	1,589
Costs and estimated profit in excess of billings	186
Billings in excess of costs and estimated profit	972
Customer deposits	0
Statement of Cash Flows [Abstract]
Inventories	(304)
Costs and estimated profit in excess of billings	379
Billings in excess of costs and estimated profit	(1,955)
Customer deposits	$ 0