Consolidated Statements of Stockholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Stockholders’ Equity
Public offering, shares		14,375,000
Public offering, shares		9,200,000
Exercise of warrants, shares		3,054,667
Issuance of common stock, shares	90,300	1,566,997
Issuance of common stock from exercise of stock options, shares	2,000
Issuance of common stock from vesting of restricted stock awards	1,201,555