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Credit Agreement - Schedule of Credit Agreement (Detail) - Credit Agreement [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Credit Agreement: |  |  |
Credit facility remaining availability |  | $ 47,782 | $ 47,782
Outstanding letters of credit | [1] | 2,218 | 2,218
Availability of additional letters of credit | [2] | $ 22,782 | $ 22,782
Weighted average annual interest rate |  | 0.00% | 0.00%
Commitment fee rate |  | 0.30% | 0.30%
Letter of credit fee rate |  | 1.25% | 1.25%
[1] | As of December 31, 2018, outstanding letters of credit not related to the credit agreement totaled $0.3 million, fully collateralized with restricted cash.
[2] | The letters of credit sublimit of $25.0 million as of December 31, 2019 and 2018, respectively, under the credit agreement is part of, not in addition to, the $50.0 million commitments as of December 31, 2019 and 2018, respectively.

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- Definition Credit agreements. + References No definition available. + Details
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- Definition Line of credit facility availability for additional letters of credit. + References No definition available. + Details
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Balance Type: | credit
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- Definition Line of credit facility percentage of letter of credit fee rate. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Period Type: | instant

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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Details
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