Preferred Stock and Common Stock - Additional Information (Details) - shares	Jun. 30, 2019	Dec. 31, 2018
Temporary Equity Disclosure [Abstract]
Preferred stock, shares authorized	10,000,000
Common stock, shares authorized	150,000,000	150,000,000
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Common stock, shares issued	35,817,393	28,055,344
Common stock, shares outstanding	35,817,393	28,055,344