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Credit Facilities and Debt - Additional Information (Details) |  |  | 6 Months Ended
--- | --- | --- | ---
Apr. 17, 2020 USD ($) | Feb. 28, 2020 | Jun. 30, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |
Revolving credit facility |  |  | $ 40,000,000.0
Maturity date |  |  | Jun. 09, 2021
Financial covenants, minimum current assets to current liabilities ratio |  |  | 1.25
Financial covenants, minimum net worth |  |  | $ 130,000,000.0
Debt instrument, covenant terms percent of proceeds from stock issuance added to net worth requirement (percentage) |  |  | 100.00%
Cash, cash equivalents, and short-term investments |  |  | $ 69,200,000
Financial covenant, maximum funded debt to tangible net worth ratio |  |  | 0.50
Outstanding borrowings under our Credit Agreement |  |  | $ 0
Total outstanding letters of credit |  |  | 9,800,000
Remaining borrowing capacity on line of credit |  |  | 30,200,000
Tangible net worth |  |  | $ 154,100,000
Current ratio |  |  | 1.76
Funded debt to tangible net worth ratio |  |  | 0.13
Surety bonds |  |  | $ 371,800,000
Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Stated interest rate (percentage) |  | 2.00% |
Letter of Credit | Prime Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate (percentage) |  |  | 3.25%
Letter of Credit | London Interbank Offered Rate (LIBOR) |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate (percentage) |  | 2.00% | 0.18%
Revolving Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Fees on undrawn borrowings (percentage) |  | 0.40% |
PPP Loan |  |  |
Line of Credit Facility [Line Items] |  |  |
Maturity date | Apr. 17, 2022 |  |
Stated interest rate (percentage) | 1.00% |  |
Unsecured loan amount | $ 10,000,000.0 |  |
Payment term description |  |  | The PPP Loan matures on April 17, 2022, bears interest at a fixed rate of 1.0 percent per annum and is payable in monthly installments commencing on the earlier of the date on which the amount of loan forgiveness is determined or March 17, 2021.
Prepayment penalties | $ 0 |  |
Loan agreement condition terms |  |  | • Only amounts expended for Permissible Expenses during the eight-week or 24-week period, as elected by us, following April 17, 2020 (the “Covered Period”) are eligible for loan forgiveness. We have elected an eight-week Covered Period; • Of the total amount of Permissible Expenses for which forgiveness can be granted, at least 60% must be for payroll costs, or a proportionate reduction of the maximum loan forgiveness amount will occur; and
Minimum percentage of payroll costs for loan forgiveness | 60.00% |  |
Employee compensation reduction minimum percentage | 25.00% |  |
PPP loan proceeds used for permissible expenses, percentage related to payroll costs | 94.00% |  |
Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Cash, cash equivalents, and short-term investments |  |  | $ 40,000,000.0
Maximum | Letter of Credit | London Interbank Offered Rate (LIBOR) |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate (percentage) |  |  | 1.00%

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- Definition Debt Instrument, Covenant Terms, Percent of Proceeds from Stock Issuance Added to Net Worth Requirement + References No definition available. + Details
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- Definition Minimum percentage of payroll costs for loan forgiveness. + References No definition available. + Details
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- Definition PPP loan proceeds used for permissible expenses, percentage related to payroll costs. + References No definition available. + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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