Balance Sheet Components - Goodwill (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Goodwill
Beginning balance	$ 5,210,821
Goodwill acquired in conjunction with the Napo merger		$ 22,037,821
Impairment	(5,210,821)	(16,827,000)
Ending balance		5,210,821
Goodwill impairment loss	$ 5,210,821	$ 16,827,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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