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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Assumptions Used to Estimate the Fair Value of Stock Options
The fair value of each option was estimated using the Black-Scholes model on the date of grant for the periods presented using the following assumptions:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Expected life (in years)—6.086.02
6.02 - 6.08
Risk-free interest rate—1.42%0.96%
1.42% - 2.66%
Volatility—50%50%50%
Dividend yield————
Summary of Stock Option and Restricted Stock Units Award Activity
A summary of the Company’s stock option and RSU award activity under the 2013 Plan is as follows:
  RSUs OutstandingOptions Outstanding
 Shares
Available
for Grant		Number of
Shares		Weighted
Average
Grant
Date Fair
Value		Number of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term (Years)		Aggregate
Intrinsic
Value
(in thousands)
Balance at December 31, 20196,036,180 5,022,675 $10.66 8,600,441 $11.40 5.16$8,811 
Increase in shares authorized3,574,847 — — — — — — 
Options granted(1,150,178)— — 1,150,178 $8.95 — — 
Options exercised— — — (74,307)$7.11 — $220 
Options canceled or expired723,824 — — (723,824)$11.76 — — 
RSUs granted(3,304,032)3,304,032 $8.33 — — — — 
RSUs vested— (1,767,543)$10.57 — — — — 
RSUs canceled or expired789,849 (789,849)$10.91 — — — — 
RSUs vested and withheld for taxes
631,186 — — — — — — 
Balance as of September 30, 20207,301,676 5,769,315 $9.32 8,952,488 $11.09 5.15$1,559 
Vested and exercisable as of September 30, 20205,871,020 $12.13 3.74$1,526 
Summary of Assumptions Used to Estimate the Fair Value of Employee Stock Purchase Plan
The fair value of the option feature is estimated using the Black-Scholes model for the period presented based on the following assumptions:
 
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Expected life (in years)0.500.500.500.50
Risk-free interest rate0.15%2.43%
0.15% - 1.59%
2.43% - 2.50%
Volatility60%35%
55% - 60%
35%
Dividend yield————
Schedule of Stock Based Compensation Expense
The following table sets forth the total stock-based compensation expense resulting from stock options, RSUs and ESPP included in the Company’s condensed consolidated statements of operations (in thousands):
 
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Cost of revenues$442 $508 $1,264 $1,672 
Sales and marketing1,187 1,433 3,912 4,996 
Research and development1,003 1,140 2,723 3,579 
General and administrative3,857 4,527 13,122 13,445 
Total stock-based compensation
   expense
$6,489 $7,608 $21,021 $23,692