Long-term debt (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
May 06, 2016	Mar. 31, 2018	Dec. 31, 2017
Long-term Debt
Interest rate (as a percent)	8.25%
Maximum borrowing capacity		$ 50.0
Foreign currency gain		0.6	$ 0.3
Interest expense recorded		0.4	0.5
Venture debt loan facility with Hercules
Long-term Debt
Outstanding debt		$ 20.0	20.0
Discount rate (as a percent)	5.25%
Back-end fee (as a percent)	4.85%
Facility fee (as a percent)	0.75%
Percentage of worldwide cash reserves		50.00%
Aggregate maturities of loan
Amortized cost net of discount and debt issuance costs		$ 20.8	$ 20.8

The back-end fee, expressed as a percentage of outstanding loan amount.

No definition available.

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- Definition

The facility fee, expressed as a percentage of outstanding loan amount.

+ References

No definition available.

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- Definition

Contractual discount rate for interest rate under the debt agreement.

+ References

No definition available.

+ Details

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- Definition

Percentage of worldwide cash reserves under debt arrangement.

+ 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

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.

+ References

No definition available.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 45
-Paragraph 1
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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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-Subparagraph (SX 210.5-03.8)
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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- References

No definition available.

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