v3.10.0.1

Subsequent events (Details) - Subsequent events - Convertible Senior Notes $ / shares in Units, $ in Thousands	1 Months Ended
	Oct. 31, 2018 USD ($) D $ / shares $ / EquityInstruments	Oct. 02, 2018 $ / shares
Subsequent events
Gross proceeds from convertible senior notes | $	$ 201,250
Percentage of interest rate per annum	1.00%
Conversion ratio	0.0236323
Conversion price per share | $ / shares	$ 42.31
Effective conversion price, percentage of premium to share closing price	30.00%
Share price | $ / shares		$ 32.55
Percentage of redemption price	100.00%
Threshold percentage of stock price trigger	130.00%
Threshold trading days | D	20
Threshold consecutive trading days | D	30
Call option
Subsequent events
Derivative cap price (in dollars per share) | $ / EquityInstruments	65.10
Derivative cap price, minimum percentage of premium on share price	100.00%
Payment of derivative capped transactions | $	$ 23,967

X

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

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- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

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- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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- Definition

The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Definition

Percentage of premium of the effective conversion price of convertible debt instrument to the entity's share closing price.

+ References

No definition available.

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- Definition

The minimum percentage of premium on closing share price for derivative cap price.

+ References

No definition available.

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- Definition

The amount of cash outflow for payment of derivative capped transactions.

+ References

No definition available.

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