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Consolidated Balance Sheets (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock, Par Value	$ 0.001	$ 0.001
Preferred Stock, Shares Authorized	0	10,000,000
Preferred Stock, Shares Issued		0
Preferred Stock, Shares Outstanding		0
Common Stock, Par Value		$ 0.001
Common Stock, Shares Authorized		150,000,000
Common Stock, Shares Authorized	Unlimited
Common Stock, Shares, Issued	20,178,226	25,827,860
Common Stock, Shares, Outstanding	20,178,226	25,827,860

X

- Definition

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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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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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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