Amortization period of unamortized fees.

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Line of credit facility additional borrowing capacity.

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Line of credit facility amendment fees incurred and capitalized.

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Number of European banks guaranteed obligations to third parties.

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Number of foreign subsidiaries under guarantee obligations.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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 interest rate of debt outstanding.

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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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.

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Average amount borrowed under the credit facility during the period.

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Date the credit facility terminates, in CCYY-MM-DD format.

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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.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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The cash outflow to settle a bank borrowing during the year.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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Debt and Lines of Credit - Additional Information (Details)				12 Months Ended
	Oct. 12, 2018 USD ($)	Oct. 11, 2018	Feb. 28, 2018 USD ($)	Dec. 31, 2019	Jan. 31, 2019 USD ($) Bank Subsidiary	Jan. 31, 2018 USD ($) Bank Subsidiary	Jan. 31, 2017 USD ($)	Jan. 31, 2019 CHF (SFr) Bank Subsidiary	Jan. 31, 2018 CHF (SFr) Bank Subsidiary
Debt Instrument [Line Items]
Repayment of outstanding debt					$ 25,000,000	$ 5,000,000	$ 13,000,000
Cash paid for interest					500,000	1,200,000	$ 1,100,000
Credit Agreement Due on October 12, 2023
Debt Instrument [Line Items]
Amendment fees incurred and capitalized					700,000
Payment for unamortized fees					$ 300,000
Amortization period					60 months
Unsecured Debt \| Swiss subsidiary
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 7,000,000	6,500,000		SFr 6,500,000	SFr 6,500,000
Outstanding borrowing amount					0	0
Revolving Credit Facility \| Secured Debt \| Credit Agreement Due on October 12, 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100,000,000
Uncommitted increase to borrowing capacity	$ 50,000,000
Credit facility matures date	Oct. 12, 2023
Loan drawn under the facility					50,300,000	25,000,000		SFr 50,000,000
Line of credit facility remaining borrowing capacity					49,400,000	74,700,000
Repayment of outstanding debt			$ 25,000,000
Weighted average borrowing amount					$ 15,800,000	$ 29,300,000
Weighted average interest rate					1.25%	2.64%		1.25%	2.64%
Revolving Credit Facility \| Secured Debt \| Credit Agreement Due on October 12, 2023 \| Minimum \| LIBOR
Debt Instrument [Line Items]
Applicable margin rate		1.25%		1.00%		1.25%
Revolving Credit Facility \| Secured Debt \| Credit Agreement Due on October 12, 2023 \| Minimum \| Base Rate
Debt Instrument [Line Items]
Applicable margin rate		0.25%		0.00%		0.25%
Revolving Credit Facility \| Secured Debt \| Credit Agreement Due on October 12, 2023 \| Maximum \| LIBOR
Debt Instrument [Line Items]
Applicable margin rate		1.75%		1.75%
Revolving Credit Facility \| Secured Debt \| Credit Agreement Due on October 12, 2023 \| Maximum \| Base Rate
Debt Instrument [Line Items]
Applicable margin rate		0.75%		0.75%
Letter of Credit
Debt Instrument [Line Items]
Credit facility matures date					May 31, 2019
Outstanding borrowing amount					$ 300,000	$ 300,000
Letter of Credit \| Secured Debt \| Credit Agreement Due on October 12, 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000
Letter of Credit \| Unsecured Debt \| Swiss subsidiary
Debt Instrument [Line Items]
Number of European banks guaranteed obligations to third parties \| Bank					2	2		2	2
Number of foreign subsidiaries under guaranteed obligation \| Subsidiary					2	2		2	2
Guaranteed obligations to third parties					$ 1,200,000	$ 1,200,000
Restricted deposit relates to lease agreement					$ 600,000	$ 500,000
Swingline \| Secured Debt \| Credit Agreement Due on October 12, 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	25,000,000
Swiss Borrowers \| Secured Debt \| Credit Agreement Due on October 12, 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 75,000,000