Goodwill and Intangible Assets - Summary of Goodwill Activity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance		$ 0	$ 3,020
Goodwill impairment	$ (3,000)	$ 0	(3,020)
Ending balance			$ 0

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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