Notes Payable - Schedule of Notes Payable (Details) - USD ($) $ in Thousands  | 
Mar. 31, 2020  | 
Dec. 31, 2019  | 
|---|---|---|
| Total notes payable, current portion | $ 310 | $ 296 | 
| Total notes payable, non-current portion | 8,323 | 8,404 | 
| Green Bank | ||
| Total notes payable, current portion | 310 | 296 | 
| Total notes payable, non-current portion | $ 8,323 | $ 8,404 | 
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- Definition Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Details 
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