XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jan. 02, 2018 | Dec. 31, 2017
Account receivables, net of allowance | $ 6,075 | $ 7,940 |
Unbilled receivables - current | 3,018 | 4,574 |
Unbilled receivables - non-current | 129 | 184 |
Deferred revenue | 4,472 | $ 5,083 | $ 4,311
Year-to-date Change [Member] |  |  |
Account receivables, net of allowance | (1,865) |  |
Unbilled receivables - current | (1,529) |  |
Unbilled receivables - non-current | (55) |  |
Deferred revenue | $ (611) |  |
Changes in Account receivables, net of allowance, percentage | (23.50%) |  |
Changes in Unbilled receivables - current, percentage | (33.60%) |  |
Changes in Unbilled receivables - non-current, percentage | (29.90%) |  |
Changes in Deferred revenue, percentage | (12.00%) |  |

X
- Definition Percentage of change in unbilled receivables - current percentage. + References No definition available. + Details
Name: | PESI_ChangeInUnbilledReceivablesCurrentPercentage
Namespace Prefix: | PESI_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of change in account receivables, net of allowance. + References No definition available. + Details
Name: | PESI_ChangesInAccountReceivablesNetOfAllowancePercentage
Namespace Prefix: | PESI_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of change in deferred revenue. + References No definition available. + Details
Name: | PESI_ChangesInDeferredRevenuePercentage
Namespace Prefix: | PESI_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of change in unbilled receivables - non-current. + References No definition available. + Details
Name: | PESI_ChangesInUnbilledReceivablesNoncurrentPercentage
Namespace Prefix: | PESI_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unbilled receivables - non-current. + References No definition available. + Details
Name: | PESI_UnbilledReceivablesNonCurrent
Namespace Prefix: | PESI_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: 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(9)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_AccountsReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
Name: | us-gaap_DeferredRevenueCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AwardDateAxis=PESI_YearToDateChangesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |