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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based Compensation
Stock Options
The following table summarizes the activity for all stock options under all of the Company’s equity incentive plans for the six months ended June 30, 2020 (shares and aggregate intrinsic value in thousands):
Number of OptionsWeighted Average Exercise PriceWeighted Average Remaining Contractual LifeAggregate Intrinsic Value
Outstanding at December 31, 201910,784  $7.38  6.52$71,745  
Granted1,483  11.20  
Exercised(1,396) 6.18  
Cancelled(380) 9.16  
Outstanding at June 30, 202010,491  $8.01  6.67$122,842  
Options vested and exercisable at June 30, 20206,933  $6.57  5.63$91,150  
Restricted Stock Units
The following table summarizes the activity for all restricted stock units (“RSUs”) under all of the Company’s equity incentive plans for the six months ended June 30, 2020 (shares in thousands):
Number of AwardsWeighted Average Grant Date Fair Value
Unvested balance at December 31, 20193,943  $11.42  
Granted3,138  11.99  
Issued(2,128) 11.98  
Cancelled / forfeited(403) 10.70  
Unvested balance at June 30, 20204,550  $11.61  
Employee Stock Purchase Plan
Under the Company's 2015 Employee Stock Purchase Plan ("ESPP"), eligible employees are offered shares bi-annually through a 24-month offering period that encompasses four six-month purchase periods. Each purchase period begins on the first trading day on or after May 15 and November 15 of each year. Employees may purchase a limited number of shares of the Company’s common stock via regular payroll deductions at a discount of 15% of the lower of the fair market value of the Company’s common stock on the first trading date of each offering period or on the exercise date. Employees may deduct up to 15% of payroll, with a cap of $25,000 of fair market value of shares in any calendar year and 10,000 shares per employee per purchase period.
Stock-Based Compensation Expense
The Company recognized stock-based compensation expense, including ESPP expenses, in the consolidated statements of operations as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Cost of customer agreements and incentives$930  $624  $2,876  $1,255  
Cost of solar energy systems and product sales
270  190  943  358  
Sales and marketing1,821  1,303  5,299  2,431  
Research and development466  408  1,541  744  
General and administration6,895  4,258  18,668  7,778  
Total$10,382  $6,783  $29,327  $12,566