Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
Stockholders' deficiency:
Preferred stock, par value (in dollars per share)	$ 1
Preferred stock, shares authorized (in shares)	10,000,000
Common stock, par value (in dollars per share)	$ 0.1
Common stock, shares authorized (in shares)	250,000,000
Common stock, shares issued (in shares)	153,293,358	148,084,900
Common stock, shares outstanding (in shares)	153,293,358	148,084,900