Description of Business and Principles of Consolidation - Public offering (Details) - Common Stock [Member] $ / shares in Units, $ in Millions	Oct. 06, 2020 USD ($) $ / shares shares
Number shares issuance public offering	5,462,500
Public offering price per share | $ / shares	$ 1.75
Number of shares exercise of the underwriters option to purchase	712,500
Proceeds from issuance public offering | $	$ 8.7