Project contract period.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Significant accounting policies.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

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Balance Type:	debit
Period Type:	instant

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Balance Type:	credit
Period Type:	duration

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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Significant Accounting Policies [Line Items]
Capitalized contract cost, amortization period	1 year
Total revenues	$ 294,022	$ 326,160
Operating lease, right of use asset	36,403
Total lease obligations	$ 42,199
Accounting Standards Update 2016-02
Significant Accounting Policies [Line Items]
Operating lease, right of use asset			$ 40,800
Total lease obligations			$ 46,500
Minimum
Significant Accounting Policies [Line Items]
Project contract period	3 years
Maximum
Significant Accounting Policies [Line Items]
Project contract period	5 years
Largest Customer \| Customer Concentration Risk \| Revenues
Significant Accounting Policies [Line Items]
Total revenues	$ 40,600
Concentration risk	14.00%
Second Largest Customer \| Customer Concentration Risk \| Revenues
Significant Accounting Policies [Line Items]
Total revenues	$ 29,500
Concentration risk	10.00%