Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Percentage of total revenue accounted for percentage-of-completion revenue, less than									0.10%	0.10%	0.10%
Product sales as a percentage of total revenue									95.00%	95.00%	95.00%
Revenue	$ 19,526	$ 21,879	$ 34,692	$ 43,256	$ 43,449	$ 53,709	$ 39,546	$ 41,069	$ 119,353	$ 177,773	$ 243,106
Operating expenses (excluding depreciation and amortization)									149,225	159,808	188,744
Products
Disaggregation of Revenue [Line Items]
Revenue									115,471	172,412	237,211
Operating expenses (excluding depreciation and amortization)									147,709	152,846	182,330
Services
Disaggregation of Revenue [Line Items]
Revenue									3,882	5,361	5,895
Operating expenses (excluding depreciation and amortization)									$ 1,516	$ 6,962	$ 6,414