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Net proceeds after deducting offering expenses.

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Proceeds from stock options exercised with shares issued subsequent to year end.

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Face amount or stated value per share of common stock.

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

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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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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The cash inflow from the additional capital contribution to the entity.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of new stock issued during the period.

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Number of shares related to Restricted Stock Award forfeited during the period.

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Common Stock - Additional Information (Details)		12 Months Ended
Common Stock - Additional Information (Details)	Jul. 02, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) Vote $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Mar. 07, 2018 $ / shares	May 31, 2015 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Outstanding		71,139,402	57,281,861
Preferred Stock, Shares Issued		0	0
Preferred Stock, Shares Outstanding		0	0
Common stock vote per share \| Vote		1
Share-based compensation arrangement by share-based payment award, options, exercises in period		156,300
Share-based compensation arrangements by share-based payment award, options, exercises in period, weighted average exercise price \| $ / shares		$ 4.93
Proceeds from stock options exercised \| $		$ 3,000	$ 1,264,000	$ 315,000
Proceeds from stock options exercised with shares issued subsequent to year end \| $		$ 64,000	$ 428,000
Exercise of stock options (note 17) (in shares)		156,300
Common Stock, Par or Stated Value Per Share \| $ / shares		$ 0.001	$ 0.001		$ 0.001
- Proceeds from issuance of common stock, net of share issuance costs \| $		$ 85,304,000	$ 1,264,000	$ 315,000
Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, new issues	11,800,000
Common Stock, Par or Stated Value Per Share \| $ / shares	$ 7.35
- Proceeds from issuance of common stock, net of share issuance costs \| $	$ 85,299
Net proceeds, after deducting offering expenses \| $	$ 1,431,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award, forfeited		51,500		14,800
Common Stock, Par or Stated Value Per Share \| $ / shares						$ 0.001
Range Of Exercise Prices Dollars 2.37 \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, exercises in period		1,219	31,000	101,600
Share-based compensation arrangements by share-based payment award, options, exercises in period, weighted average exercise price \| $ / shares		$ 2.37	$ 2.37	$ 2.37
Exercise of stock options (note 17) (in shares)		1,219	31,000	101,600
Range Of Exercise Prices Dollars 4.98 \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, exercises in period		107,822	239,100	18,400
Share-based compensation arrangements by share-based payment award, options, exercises in period, weighted average exercise price \| $ / shares		$ 4.98	$ 4.98	$ 4.98
Exercise of stock options (note 17) (in shares)		107,822	239,100	18,400
Cashless excisable. \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, exercises in period		156,300
Exercise of stock options (note 17) (in shares)		156,300