Common Stock - Additional Information (Detail) - $ / shares	Dec. 31, 2016	Dec. 31, 2015	Feb. 12, 2013
Equity [Abstract]
Common stock, shares authorized	500,000,000	500,000,000	500,000,000
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Convertible preferred stock, par value	$ 0.001	$ 0.001	$ 0.001