General form of registration statement for all companies including face-amount certificate companies

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

v3.20.2
Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Statement of Stockholders' Equity [Abstract]  
Common stock, shares exchanged | shares 298,615
Conversion of senior convertible notes, costs $ 82,502
Issuance of common stock units for cash, cost 308,830
Issuance of common stock units for a future research funding commitment, cost $ 168,457