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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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Summary of Significant Accounting Policies - Property and Equipment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accounting Policies [Abstract]
Depreciation expense related to property and equipment	$ 755,000	$ 902,000	$ 2,464,000	$ 1,835,000
Accumulated depreciation	2,119,000		2,119,000		$ 9,110,000
Property and Equipment, Net
Impairment of long-lived assets	$ 0	$ 0	$ 0	$ 0
Computer hardware
Property and Equipment, Net
Estimated useful life			3 years
Furniture and fixtures
Property and Equipment, Net
Estimated useful life			7 years
Computer software
Property and Equipment, Net
Estimated useful life			3 years
Office equipment
Property and Equipment, Net
Estimated useful life			3 years