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Common stock, treasury stock and warrants - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Equity [Line Items]
Common stock, shares issued	55,528,094	53,717,996
Treasury stock, shares	348,002	160,235
Treasury stock, value	$ 1,254	$ 531
Warrants outstanding	2,220,102	2,220,102
Minimum [Member]
Equity [Line Items]
Exercise price of warrants	$ 3.75
Maximum [Member]
Equity [Line Items]
Exercise price of warrants	$ 10.00
Restricted Stock Units [Member]
Equity [Line Items]
Shares issued from vesting	1,810,098
Common shares withheld to pay withholding taxes	187,767

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Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Number of warrants or rights outstanding.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Subparagraph (SX 210.4-08.(i))
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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Number of share instruments newly issued under a share-based compensation plan.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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-Publisher FASB
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