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Stockholders' Equity - Summary of Authorized and Issued Common and Preferred Stock (Details) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Summary of common and preferred stock authorized, issued and outstanding
Common stock, par value (dollars per share)	$ 0.001	$ 0.001
Common stock, shares, authorized (shares)	600,000,000
Common stock, shares, issued (shares)	91,474,395
Common stock, shares, outstanding (shares)	91,474,395	90,357,644
Series C Preferred Stock
Summary of common and preferred stock authorized, issued and outstanding
Preferred stock, par value (dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (shares)	1,091
Preferred stock, shares issued (shares)	1,091
Preferred stock, shares outstanding (shares)	23	23

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