Stockholders' Equity - Common stock reserved for future issuance (Details) shares in Thousands	Dec. 31, 2020 shares
Schedule of common stock reserved for future issuance
Common Stock, Capital Shares Reserved for Future Issuance	2,465
Warrant
Schedule of common stock reserved for future issuance
Common Stock, Capital Shares Reserved for Future Issuance	2,437
Employee Stock Option
Schedule of common stock reserved for future issuance
Common Stock, Capital Shares Reserved for Future Issuance	28