Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)

v3.19.2
Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($)
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]      
Issuance of common stock in registered direct offering, net of costs $ 466,000 $ 234,893 $ 525,566