Quarterly report pursuant to Section 13 or 15(d)

Net Loss Per Common Share - Schedule of Potential Common Shares Outstanding Excluded from the Computation of Diluted Net Loss Per Share (Details)

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Net Loss Per Common Share - Schedule of Potential Common Shares Outstanding Excluded from the Computation of Diluted Net Loss Per Share (Details) - shares
shares in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Anti-dilutive securities    
Total common stock equivalents (in shares) 73,635 35,857
Shares issuable upon conversion of preferred stock    
Anti-dilutive securities    
Total common stock equivalents (in shares) 47,449 0
Restricted stock units    
Anti-dilutive securities    
Total common stock equivalents (in shares) 17,873 23,830
Options to purchase common stock    
Anti-dilutive securities    
Total common stock equivalents (in shares) 6,290 9,367
Performance awards    
Anti-dilutive securities    
Total common stock equivalents (in shares) 1,016 2,056
Shares issuable pursuant to the ESPP    
Anti-dilutive securities    
Total common stock equivalents (in shares) 1,007 604