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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	10. Subsequent Events Dividends on 6% Preferred Stock On September 10, 2020, the board of directors declared a quarterly cash dividend in the amount of $0.15 per share on the Company’s 6% Preferred Stock. The cash dividend was paid on November 1, 2020 to the holders of record of the 6% Preferred Stock as of the close of business on October 16, 2020. 2020 Inducement Plan On October 22, 2020, the Company adopted the 2020 Inducement Equity Incentive Plan (the “2020 Inducement Plan”) pursuant to which it reserved an aggregate of 200,000 shares of its common stock to be used exclusively for grants of awards to individuals who were not previously employees or directors of the Company as a material inducement to such individuals’ entry into employment with the Company within the meaning of Rule 5635(c)(4) of the Nasdaq Listing Rules. The terms and conditions of the 2020 Inducement Plan are substantially similar to those of the 2018 Plan. Unless otherwise stated in an applicable stock option agreement, one-third of the shares subject to an option grant under the 2020 Inducement Plan will typically vest upon the first anniversary of the vesting start date, with the balance of the shares vesting in a series of twenty-four successive equal monthly installments as of the first day of each month measured from the first anniversary of the vesting start date, subject to the new employee’s continued service with the Company through the applicable vesting dates. Stock options generally terminate 10 years from the date of grant.