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Stockholders' Equity - Summary of Authorized and Issued Common and Preferred Stock (Details) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Summary of common and preferred stock authorized, issued and outstanding
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares, authorized (shares)	600,000,000
Common stock, shares, issued (shares)	98,584,371
Common stock, shares, outstanding (shares)	98,584,371	97,225,810
Series C Preferred Stock
Summary of common and preferred stock authorized, issued and outstanding
Preferred stock, par value (in 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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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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