Stockholders' Equity - Warrants (Details) - $ / shares	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2013
Warrants
Number of shares into which warrant issued during period may be converted		129,491
Warrant exercise price per share (in dollars per share)		$ 0.05
Contractual life of warrants		10 years
Number of shares of common stock into which warrants may be converted	39,474
Common stock issued upon exercise of warrant (in shares)	69,680