Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Percentage of total revenue accounted for percentage-of-completion revenue, less than (in percentage)		0.10%
Product sales as a percentage of total revenue (in percentage)	95.00%	95.00%
Disaggregation of Revenue [Line Items]
Revenue	$ 19,416	$ 43,256
Operating expenses (excluding depreciation and amortization):	22,841	43,968
Products
Disaggregation of Revenue [Line Items]
Revenue	18,800	42,072
Operating expenses (excluding depreciation and amortization):	22,534	43,447
Services
Disaggregation of Revenue [Line Items]
Revenue	616	1,184
Operating expenses (excluding depreciation and amortization):	$ 307	$ 521

Percentage Of Total Revenue Accounted For Percentage-Of-Completion Revenue

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- Definition

Product Sales As A Percentage Of Total Revenue

+ References

No definition available.

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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