Nature of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Accumulated deficit	$ (135,393)	$ (135,203)
Cash balance	$ 250	$ 26	$ 88	$ 25

The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant