Weighted Average Shares Outstanding and Net (Loss) Income Per Share - Summary of Reconciliation of Weighted Average Shares Outstanding in Basic and Diluted Net (Loss) Income Per Share (Parenthetical) (Details) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Antidilutive shares excluded from calculating diluted net loss per share	960,000	732,000	618,000