XML 97 R79.htm IDEA: XBRL DOCUMENT v3.6.0.2
Share-based payments - Schedule of Unvested Restricted Share Activity (Detail) - Restricted Stock Units [Member] - $ / shares
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of units, Beginning Balance   13,721,000 [1] 2,960,000
Number of units, Additions as a result of the reverse acquisition     416,800
Number of units, Granted 2,960,000 1,339,758 13,890,500 [1]
Number of units, Vested and delivered   (1,074,327) (382,300)
Number of units, Withheld as treasury stock [2]   (360,235)  
Number of units, Vested not delivered   (1,022,667) (3,085,000)
Number of units, Forfeitures   (196,500) (79,000)
Number of units, Ending Balance 2,960,000 12,407,029 13,721,000 [1]
Weighted average grant-date fair value, Beginning Balance   $ 7.78 [1] $ 2.00
Weighted average grant-date fair value, Additions as a result of the reverse acquisition     4.81
Weighted average grant-date fair value, Granted $ 2.00 4.17 9.16 [1]
Weighted average grant-date fair value, Vested and delivered   3.28 5.55
Weighted average grant-date fair value, Withheld as treasury stock [2]   1.52  
Weighted average grant-date fair value, Vested not delivered   2.59 8.36
Weighted average grant-date fair value, Forfeitures   7.16 5.78
Weighted average grant-date fair value, Ending Balance $ 2.00 $ 8.40 $ 7.78 [1]
[1] Among the grants in 2015 and the unvested balance as of December 31, 2015, 12,312,000 shares, with weighted average grant-date fair value of $9.48, were subsequently approved at the Company’s annual meeting of stockholders on June 3, 2016.
[2] As discussed in Note 14, the increase in treasury stock was due to shares withheld to pay statutory withholding taxes upon the vesting of RSUs during the year ended December 31, 2016, among which, 200,000 shares of treasury stock were subsequently sold to an investor in 2016.