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Net Income (Loss) Per Share - Additional Information (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
RSU Vesting [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Unvested RSUs 1,609,324 1,368,155 1,629,848 1,376,930