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Consolidated Balance Sheets (Parenthetical) - $ / shares | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Common stock, number of shares outstanding (in shares) | 77,881,873 | 77,525,973
Common Stock |  |
Common stock, par value (in USD per share) | $ 0.001 | $ 0.001
Common stock, number of shares authorized (in shares) | 800,000,000 | 800,000,000
Common stock, number of shares outstanding (in shares) | 77,881,873 | 77,525,973

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