Summary of Significant Accounting Policies - Goodwill, Advertising Costs, Foreign Currency Translation (Details)	12 Months Ended
Dec. 31, 2019 USD ($) reporting_unit segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure
Number of operating segments \| segment	1
Number of reportable segments \| segment	1
Number of reporting units \| reporting_unit	1
Impairment of goodwill	$ 0	$ 0	$ 0
Sales and Marketing Expenses
Advertising costs	95,000	75,000	183,000
Foreign Currency Translation Adjustments
Foreign currency translation adjustment	(238,000)	(717,000)	99,000
Net gain (loss) resulting from transactions denominated in foreign currencies	$ (50,000)	$ 4,000	$ 44,000
Technology
Goodwill and Intangible Assets Disclosure
Intangible assets estimated useful life	5 years
Customer relationships \| Minimum
Goodwill and Intangible Assets Disclosure
Intangible assets estimated useful life	6 years
Customer relationships \| Maximum
Goodwill and Intangible Assets Disclosure
Intangible assets estimated useful life	10 years

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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