Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Restricted Stock (Details)

v3.20.2
Stockholders' Equity - Restricted Stock (Details) - Unvested restricted stock (Note 6) [Member]
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Nonvested Beginning Balance | shares 3,303,839
Number of Shares, Granted | shares 1,107,340
Number of Shares, Vested | shares (397,980)
Number of Shares, Nonvested Ending Balance | shares 4,013,199
Weighted Average Exercise Price, Nonvested Beginning Balance | $ / shares $ 4.29
Weighted Average Grant Date Fair Value, Granted | $ / shares 2.39
Weighted Average Grant Date Fair Value, Vested | $ / shares 4.31
Weighted Average Exercise Price, Nonvested Ending Balance | $ / shares $ 3.77