Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Stockholders' equity (deficit):
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized shares	5,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	100,000,000	250,000
Common stock, shares issued	4,029,140	201,457
Common stock, shares outstanding	4,029,140	201,457