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Series A Preferred Stock; Exchange for Shares of Series A-1 Preferred Stock - Additional Information (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Aug. 18, 2017 | Sep. 28, 2019
Series A-1 Convertible Preferred Stock |  |
Number of shares issued upon exchange of Convertible Preferred Stock |  | 259,729
Convertible preferred stock conversion ratio |  | 20.00%
Number of shares issued upon conversion of Convertible Preferred Stock |  | 20
Issuance of number of common stock shares related to conversion |  | 19.90%
GeoTraq Inc. |  |
Cash paid for acquisition | $ 200 |
GeoTraq Inc. | One-year Unsecured Promissory Notes |  |
Business acquisition, Promissory notes issued | $ 800 |
GeoTraq Inc. | Series A Convertible Preferred Stock |  |
Business acquisition, Stock issued | 288,588 |

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