Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Common Stock (Details)

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Stockholders' Equity - Common Stock (Details) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
Equity [Abstract]    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 9,000,000,000 9,000,000,000
Common stock, shares issued (in shares) 4,481,266,000 4,530,928,000
Common stock, shares outstanding (in shares) 4,480,763,000 4,527,742,000
Common stock reserved for issuance (in shares) 303,926,000