Annual report pursuant to Section 13 and 15(d)

Net Loss per Share (Details)

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Net Loss per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares issuable under the Equity Incentive Plan      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total shares excluded as anti-dilutive (shares) 5,348 4,763 6,339