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, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares issuable under Equity Incentive Plan      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total anti-dilutive securities 4,763 6,339 6,882