Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Property and Equipment, Net
Capitalized software	$ 238	$ 356
Impairment of Long-lived Assets
Impairment of long-lived assets	$ 0	$ 0
Computer and network equipment
Property and Equipment, Net
Useful Lives	2 years
Manufacturing equipment \| Minimum
Property and Equipment, Net
Useful Lives	2 years
Manufacturing equipment \| Maximum
Property and Equipment, Net
Useful Lives	7 years
Furniture and fixtures
Property and Equipment, Net
Useful Lives	7 years
Software
Property and Equipment, Net
Useful Lives	3 years

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Additions made to capitalized computer software costs during the period.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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