Consolidated Statements of Stockholders' Deficit (Parenthetical)	Dec. 31, 2018	Feb. 22, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 18, 2013
Percentage of conversion of convertible notes	5.75%
Convertible Notes
Percentage of conversion of convertible notes	1.50%
5.75% Convertible Notes | Convertible Notes
Percentage of conversion of convertible notes	5.75%	5.75%	5.75%
1.50% Convertible Notes | Convertible Notes
Percentage of conversion of convertible notes	1.50%	1.50%	1.50%	1.50%	1.50%