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NET INCOME (LOSS) PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
The following table presents the calculation of basic and diluted net income (loss) per share (in thousands, except per share data):
 
Year Ended December 31,
 
2018
 
2017
2016
 
Common Stock
 
Common Stock
 
Class A
 
Class B
Basic net income (loss) per share attributable to common stockholders:
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
55,350

 
$
152,995

 
$
(1,574
)
 
$
(137
)
Allocation of undistributed earnings
$
55,350

 
$
152,995

 
$
(1,574
)
 
$
(137
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding
83,573

 
81,602

 
70,997

 
6,189

Basic net income (loss) per share attributable to common stockholders:
$
0.66

 
$
1.87

 
$
(0.02
)
 
$
(0.02
)
 
Year Ended December 31,
 
2018
 
2017
2016
 
Common Stock
 
Common Stock
 
Class A
 
Class B
Diluted net income (loss) per share attributable to common stockholders:
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Allocation of undistributed earnings for basic calculations
$
55,350

 
$
152,995

 
$
(1,574
)
 
$
(137
)
Reallocation of undistributed earnings as a result of conversion from Class B to Class A shares
—

 
—

 
(137
)
 
—

Allocation of undistributed earnings
$
55,350

 
$
152,995

 
$
(1,711
)
 
$
(137
)
Denominator:
 
 
 
 
 
 
 
Number of shares used in basic calculation
83,573

 
81,602

 
70,997

 
6,189

Weighted-average effect of dilutive securities
 
 
 
 
 
 
 
Conversion of Class B to Class A common shares outstanding
—

 
—

 
6,189

 
—

Stock options
2,984

 
3,279

 
—

 
—

Restricted stock units
2,137

 
2,289

 
—

 
—

Employee stock purchase program
15

 
—

 
—

 
—

Number of shares used in diluted calculation
88,709

 
87,170

 
77,186

 
6,189

Diluted net income (loss) per share attributable to common stockholders
$
0.62

 
$
1.76

 
$
(0.02
)
 
$
(0.02
)
Schedule of Anti-dilutive Securities
The following weighted-average stock-based instruments were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive for the periods presented (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Stock options
2,030

 
1,659

 
2,082

Restricted stock units and awards
373

 
593

 
2,090