XML 63 R52.htm IDEA: XBRL DOCUMENT v3.8.0.1
STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Stock Options  
Beginning balance, outstanding (in shares) 727
Granted (in shares) 0
Exercised (in shares) (63)
Forfeited (in shares) 0
Ending balance, outstanding (in shares) 664
Exercisable at end of period (in shares) 464
Unvested at end of period (in shares) 240
Weighted Average Exercise Price  
Beginning balance, Outstanding (in dollars per share) | $ / shares $ 5.82
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 4.93
Forfeited (in dollars per share) | $ / shares 0.00
Beginning balance, Outstanding (in dollars per share) | $ / shares 5.91
Exercisable at end of period (in dollars per share) | $ / shares 4.79
Unvested at end of period (in dollars per share) | $ / shares $ 9.16
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Weighted Average Remaining Contractual Term, Outstanding 6 years 2 months
Weighted Average Remaining Contractual Term, Exercisable 5 years 5 months
Weighted Average Remaining Contractual Term, Unvested 8 years
Aggregate Intrinsic Value, Outstanding at end of period | $ $ 11,595
Aggregate Intrinsic Value, Exercisable at end of period | $ 8,619
Aggregate Intrinsic Value, Unvested at end of period | $ $ 3,413
Market-based Performance Stock Options  
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value  
Percentage of vesting of share-based compensation awards 100.00%
Issuance of additional shares (in shares) 40