Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	30 Months Ended
	Mar. 29, 2019	Feb. 26, 2019	Jun. 30, 2019	Dec. 31, 2021	Dec. 31, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Preferred stock, shares authorized (in shares)					2,000,000	2,000,000
Subsequent Event
Subsequent Event [Line Items]
Proceeds from issuance of subordinated convertible promissory notes	$ 1,700
Weighted average stock price (in dollars per share)	$ 0.20
Interest rate on convertible notes			5.00%	10.00%
Series A Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Preferred stock, shares authorized (in shares)	2,000,000
Energy Focus, Inc. | Subsequent Event
Subsequent Event [Line Items]
Ownership position		17.60%
James Tu Through Fusion Park LLC | Subsequent Event
Subsequent Event [Line Items]
Proceeds from issuance of subordinated convertible promissory notes		$ 580
Brilliant Start Enterprise, Inc. | Subsequent Event
Subsequent Event [Line Items]
Proceeds from issuance of subordinated convertible promissory notes		$ 500