v3.20.2
Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2020
Stockholders' Equity Note [Abstract]  
Schedule of shares of common stock reserved for future issuance As of September 30, 2020, there were 71,294,706 shares of common stock outstanding, and the Company had reserved a total of 26,355,976 of its authorized shares of common stock for future issuance as follows:
Shares Reserved for Future Issuance
Outstanding restricted stock units3,431,829 
Outstanding performance restricted stock units1,760,164 
Outstanding stock options4,023,741 
Reserved for convertible senior notes17,140,242 
Total shares of common stock reserved for future issuance26,355,976 
Schedule of stock-based compensation expense included in the consolidated statements of operations and comprehensive loss
The following table presents stock-based compensation expense related to the Stock Plans and the ESPP, contained on the following line items on the Company’s condensed consolidated statements of operations and comprehensive loss for each of the periods indicated.
 Three Months Ended
September 30,
Nine Months Ended
September 30,
 2020201920202019
 (in thousands)
Curriculum and teaching$21 $30 $212 $38 
Servicing and support3,409 2,626 10,979 6,129 
Technology and content development3,059 2,228 9,164 5,732 
Marketing and sales1,618 2,238 6,704 4,981 
General and administrative13,894 9,413 36,903 19,206 
Total stock-based compensation expense$22,001 $16,535 $63,962 $36,086 
Schedule of restricted and performance restricted stock unit activity The following table presents a summary of the Company’s RSU activity for the period indicated.
 Number of
Units
Weighted-
Average Grant
Date Fair Value per Share
Outstanding balance as of December 31, 20192,281,142 $40.49 
Granted1,911,308 20.66 
Vested(550,624)51.84 
Forfeited(209,997)30.17 
Outstanding balance as of September 30, 20203,431,829 $28.25 
The following table presents a summary of the Company’s PRSU activity for the period indicated.
 Number of
Units
Weighted-
Average Grant
Date Fair Value per Share
Outstanding balance as of December 31, 20191,413,773 $28.12 
Granted657,723 22.45 
Vested(38,748)22.38 
Forfeited(272,584)48.87 
Outstanding balance as of September 30, 20201,760,164 $22.91 
Schedule of stock option activity The following table presents a summary of the Company’s stock option activity for the period indicated.
 Number of
Options
Weighted-Average
Exercise Price per
Share
Weighted-Average Remaining Contractual Term (in years)Aggregate
Intrinsic
Value
(in thousands)
Outstanding balance as of December 31, 20194,373,895 $34.24 5.88$28,736 
Granted8,597 19.61 
Exercised(277,375)11.26 
Forfeited(46,452)61.21 
Expired(34,924)43.72 
Outstanding balance as of September 30, 20204,023,741 35.40 5.2647,336 
Exercisable as of September 30, 20203,202,271 $27.36 4.56$46,521