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Share-based compensation - Schedule of Restricted Share Units, Common Stock Grants and Restricted Stock Activity (Detail) - Restricted Stock Units, Common Stock Grants and Restricted Stock [Member]
 6 Months Ended
Jun. 30, 2018
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of units, Beginning Balance | shares 8,150,905
Number of units, Granted | shares 4,368,125 [1]
Number of units, Vested and delivered | shares (11,455,574) [2]
Number of units, Withheld as treasury stock | shares (872,562) [3]
Number of units, Vested not delivered | shares 3,761,068 [4]
Number of units, Forfeitures | shares (201,959)
Number of units, Ending Balance | shares 3,750,003
Weighted average grant-date fair value, Beginning Balance | $ / shares $ 9.27
Weighted average grant-date fair value, Granted | $ / shares 2.65 [1]
Weighted average grant-date fair value, Vested and delivered | $ / shares 7.63 [2]
Weighted average grant-date fair value, Withheld as treasury stock | $ / shares 6.05 [3]
Weighted average grant-date fair value, Vested not delivered | $ / shares 9.86 [4]
Weighted average grant-date fair value, Forfeitures | $ / shares 5.13
Weighted average grant-date fair value, Ending Balance | $ / shares $ 8.14
[1] As discussed in “Spin-off of red violet” above, among the RSUs granted during the six months ended June 30, 2018, there were an aggregate of 304,000 shares of Spin-off Grants that vested and were delivered in the first quarter of 2018, and an aggregate of 2,041,000 shares of Transaction Grants that vested but were subject to deferred delivery over a three-year period.
[2] Among the shares vested and delivered during the six months ended June 30, 2018, there were 6,273,318 shares that were vested but deferred from prior periods. See (4) below.
[3] As discussed in Note 8, the increase in treasury stock was due to shares withheld to pay statutory withholding taxes upon the vesting of RSUs during the first quarter of 2018. As of June 30, 2018, there were 1,225,085 outstanding shares withheld as treasury stock.
[4] Vested not delivered represent vested RSUs or common stock grants with delivery deferred to a future time. During the six months ended June 30, 2018, there was a net decrease of 3,761,068 shares included in “vested not delivered,” as a result of the delivery of common stock underlying RSUs included in “vested not delivered” in prior periods. As of June 30, 2018, there were 2,914,917 outstanding shares of RSUs or common stock grants included in “vested not delivered.”