Promissory Notes (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Principal amount	$ 565	$ 26,932
Carrying amount	$ 568	14,653
Long-term Note		$ 6,640
Advantech Capital Investment II Limited
Short-term Debt [Line Items]
Interest rate	8.00%	8.00%
Principal amount		$ 12,000
Carrying amount		3,193
Convertible Note
Short-term Debt [Line Items]
Short-term Note	$ (568)	$ (8,013)
Convertible Note \| Mr.McMahon
Short-term Debt [Line Items]
Interest rate	4.00%	4.00%
Principal amount		$ 3,000
Carrying amount		$ 3,260
Convertible Note With Maturity February 8, 2020 \| SSSIG
Short-term Debt [Line Items]
Interest rate	4.00%	4.00%
Principal amount		$ 1,252
Carrying amount		$ 1,301
Convertible Note With Maturity November 25, 2020 \| SSSIG
Short-term Debt [Line Items]
Interest rate	4.00%	4.00%
Principal amount		$ 250
Carrying amount		$ 250
Senior Secured Convertible Note (b)
Short-term Debt [Line Items]
Interest rate	10.00%	10.00%
Principal amount		$ 850
Carrying amount		$ 348
Senior Secured Convertible Note (c)
Short-term Debt [Line Items]
Interest rate	10.00%	10.00%
Principal amount		$ 3,580
Carrying amount		$ 1,896
Senior Secured Convertible Note (d)
Short-term Debt [Line Items]
Interest rate	4.00%	4.00%
Principal amount		$ 3,000
Carrying amount		$ 1,405
Convertible Debenture
Short-term Debt [Line Items]
Interest rate	4.00%	4.00%
Promissory Note
Short-term Debt [Line Items]
Interest rate	6.00%	6.00%
Principal amount		$ 3,000
Carrying amount		$ 3,000
Vendor Notes Payable
Short-term Debt [Line Items]
Principal amount	$ 105
Carrying amount	$ 105
Vendor Notes Payable \| Minimum
Short-term Debt [Line Items]
Interest rate	0.25%	0.25%
Vendor Notes Payable \| Maximum
Short-term Debt [Line Items]
Interest rate	4.00%	4.00%
Small Business Association Paycheck Protection Program (h)
Short-term Debt [Line Items]
Interest rate	1.00%	1.00%
Principal amount	$ 460
Carrying amount	$ 463

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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