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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 26, 2018 | Jan. 12, 2018 | Dec. 31, 2014 | Aug. 31, 2014 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 26, 2019 | Jan. 08, 2019 | Jul. 17, 2018 | Dec. 22, 2017 | Feb. 15, 2017 | Jul. 29, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings under revolving credit facility |  |  |  |  |  |  | $ 53,500,000 |  |  |  |  |  |  |
Weighted-average interest rate of borrowings |  |  |  |  |  |  | 4.85% |  |  |  |  |  |  |
Credit facility remaining borrowing capacity |  |  |  |  |  |  | $ 18,500,000 |  |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing base |  |  |  |  |  |  | $ 72,000,000 |  | $ 90,000,000 | $ 100,000,000 |  |  |  |
Additional Equipment Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility remaining borrowing capacity |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |
Equipment Loan, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000
Percentage for base rate loans at the prime rate | 3.50% |  |  | 3.40% |  |  |  |  |  |  |  |  |  |
Equipment Loan, monthly payment | $ 7,986 |  |  | $ 87,800 |  |  |  |  |  |  |  |  |  |
Additional equipment Loan, drawings |  |  | $ 500,000 | $ 4,800,000 |  |  |  |  |  |  |  |  |  |
Equipment Loan, interest rate description |  |  |  |  |  | interim draws to finance the acquisition of any future field service equipment. In December 2014, the Company made an interim draw of an additional $0.5 million on this facility that is secured by recently purchased field service equipment. Interim draws on this facility carried a floating interest rate; payable monthly at the LIBO published rate plus 2.50% and on June 26, 2015 converted into a fixed term loan, with a rate of 3.50% and requiring monthly payments |  |  |  |  |  |  |  |
Equipment Loan, principal payment amount |  | $ 20,858 |  |  |  |  |  |  |  |  |  |  |  |
Fixed Term Loan [Member] | Additional Equipment Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equipment Loan, monthly payment | $ 8,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Equipment Loan, maturity date |  |  |  |  |  |  | Jun. 26, 2020 |  |  |  |  |  |  |
Equipment Loan, Interest rate on fixed loans |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |
2017 Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Credit agreement date |  |  |  |  |  |  |  | Feb. 15, 2017 |  |  |  |  |  |
Credit facility borrowing base |  |  |  |  |  |  |  |  |  |  |  | $ 85,000,000 |  |
Line of Credit Facility, Expiration Date |  |  |  |  |  |  |  | Feb. 15, 2021 |  |  |  |  |  |
Revolving Line of Credit and Letter of Credit Facility [Member] | Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing base |  |  |  |  |  |  |  |  |  |  | $ 90,000,000 |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Additional Equipment Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR rate loans |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |
Base Rate And Libor [Member] | Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument basis weighted average interest rate spread on variable rate |  |  |  |  |  |  | 5.34% | 5.33% |  |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + 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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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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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