Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Summary of Increase in Maximum Number of Shares Issuable to Stockholders (Details)

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Stock-based Compensation - Summary of Increase in Maximum Number of Shares Issuable to Stockholders (Details) - 2014 Equity Incentive Plan - shares
1 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Original share pool (in shares)         2,058,000
Increase (in shares) 4,400,000 1,000,000 3,500,000 1,656,000  
Total share authorized for grant (in shares)     12,614,000