Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Summary of Shares Available for Future Grant (Details)

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Stock-based Compensation - Summary of Shares Available for Future Grant (Details) - 2014 Equity Incentive Plan - shares
shares in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2015
Shares Available For Grant        
Beginning balance (in shares)     1,267  
Granted (in shares)     (4,344)  
Forfeited (in shares)     938  
Expired (in shares)     437  
Share pool increase (in shares) 4,400 1,000 3,500 1,656
Ending balance (in shares)     1,798