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Cash and cash equivalents (Details 4) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Scotiabank Sud Americano |
Description of type of deposit | Fixed term |
Short term deposits, original currency | US$ |
Short term deposits, Interest rate | 3.20% |
Date of short term deposit | Nov. 13, 2019 |
Short term deposits, Maturity | Jan. 30, 2020 |
Notional amount | $ 148,728 | $ 16,796
Accrued income | 371 | 432
Short-term deposits, classified as cash equivalents | $ 149,099 | $ 187,666
Short term deposit One [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco crédito e inversiones | Scotiabank
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 3.45% | 2.50%
Date of short term deposit | Nov. 18, 2019 | Oct. 18, 2018
Short term deposits, Maturity | Feb. 13, 2020 | Jan. 16, 2019
Notional amount | $ 18,000 | $ 14,606
Accrued income | 74 | 90
Short-term deposits, classified as cash equivalents | $ 18,074 | $ 14,696
Short term deposit Two [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco crédito e inversiones | Banco Crédito e Inversiones
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 2.85% | 2.55%
Date of short term deposit | Dec. 26, 2019 | Nov. 06, 2018
Short term deposits, Maturity | Feb. 20, 2020 | Jan. 09, 2019
Notional amount | $ 20,000 | $ 19,632
Accrued income | 8 | 92
Short-term deposits, classified as cash equivalents | $ 20,008 | $ 19,724
Short term deposit Three [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco de Chile | Scotiabank
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 3.45% | 2.55%
Date of short term deposit | Nov. 15, 2019 | Nov. 30, 2018
Short term deposits, Maturity | Jan. 23, 2020 | Jan. 03, 2019
Notional amount | $ 14,000 | $ 14,393
Accrued income | 62 | 38
Short-term deposits, classified as cash equivalents | $ 14,062 | $ 14,431
Short term deposit Four [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco de Chile | Scotiabank
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 3.50% | 2.55%
Date of short term deposit | Nov. 15, 2019 | Dec. 03, 2018
Short term deposits, Maturity | Jan. 09, 2020 | Jan. 03, 2019
Notional amount | $ 18,000 | $ 11,515
Accrued income | 80 | 27
Short-term deposits, classified as cash equivalents | $ 18,080 | $ 11,542
Short term deposit Five [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco de Chile | Itau-Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 3.45% | 2.50%
Date of short term deposit | Nov. 15, 2019 | Dec. 03, 2018
Short term deposits, Maturity | Jan. 16, 2020 | Jan. 03, 2019
Notional amount | $ 18,000 | $ 14,393
Accrued income | 79 | 34
Short-term deposits, classified as cash equivalents | $ 18,079 | $ 14,427
Short term deposit Six [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Itau Chile | Itau-Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 2.90% | 2.50%
Date of short term deposit | Dec. 26, 2019 | Dec. 07, 2018
Short term deposits, Maturity | Feb. 20, 2020 | Jan. 09, 2019
Notional amount | $ 33,000 | $ 14,393
Accrued income | 13 | 29
Short-term deposits, classified as cash equivalents | $ 33,013 | $ 14,422
Short term deposit Seven [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Scotiabank Sud Americano | Itau-Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | CLP$ | Ch$
Short term deposits, Interest rate | 2.16% | 2.50%
Date of short term deposit | Dec. 30, 2019 | Dec. 10, 2018
Short term deposits, Maturity | Aug. 08, 2020 | Jan. 09, 2019
Notional amount | $ 6,812 | $ 12,954
Accrued income | 0 | 23
Short-term deposits, classified as cash equivalents | $ 6,812 | $ 12,977
Short term deposit Eight [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco crédito e inversiones | Scotiabank
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 3.51% | 2.35%
Date of short term deposit | Nov. 21, 2019 | Dec. 10, 2018
Short term deposits, Maturity | Jan. 28, 2020 | Jan. 09, 2019
Notional amount | $ 1,000 | $ 12,954
Accrued income | 4 | 21
Short-term deposits, classified as cash equivalents | $ 1,004 | $ 12,975
Short term deposit Nine [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco crédito e inversiones | Itau-Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 3.75% | 3.06%
Date of short term deposit | Dec. 02, 2019 | Dec. 11, 2018
Short term deposits, Maturity | Feb. 27, 2020 | Jan. 11, 2019
Notional amount | $ 2,000 | $ 1,300
Accrued income | 6 | 2
Short-term deposits, classified as cash equivalents | $ 2,006 | $ 1,302
Short term deposit Ten [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco crédito e inversiones | Banco Estado
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 3.60% | 2.75%
Date of short term deposit | Nov. 25, 2019 | Dec. 12, 2018
Short term deposits, Maturity | Jan. 28, 2020 | Jan. 15, 2019
Notional amount | $ 1,000 | $ 1,000
Accrued income | 4 | 1
Short-term deposits, classified as cash equivalents | $ 1,004 | $ 1,001
Short term deposit Eleven [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Estado | Itau-Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 2.15% | 2.50%
Date of short term deposit | Dec. 16, 2019 | Dec. 14, 2018
Short term deposits, Maturity | Jan. 06, 2020 | Jan. 09, 2019
Notional amount | $ 500 | $ 14,392
Accrued income | 0 | 20
Short-term deposits, classified as cash equivalents | $ 500 | $ 14,412
Short term deposit Twelve [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Santander - Santiago | Scotiabank
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 2.55% | 2.65%
Date of short term deposit | Dec. 09, 2019 | Dec. 17, 2018
Short term deposits, Maturity | Feb. 04, 2020 | Jan. 17, 2019
Notional amount | $ 1,700 | $ 14,393
Accrued income | 3 | 18
Short-term deposits, classified as cash equivalents | $ 1,703 | $ 14,411
Short term deposit Thirteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Corpbanca | Scotiabank
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 2.55% | 2.60%
Date of short term deposit | Dec. 16, 2019 | Dec. 17, 2018
Short term deposits, Maturity | Jan. 06, 2020 | Jan. 17, 2019
Notional amount | $ 2,500 | $ 10,892
Accrued income | 3 | 13
Short-term deposits, classified as cash equivalents | $ 2,503 | $ 10,905
Short term deposit Fourteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Corpbanca | Banco Crédito e Inversiones
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 3.64% | 2.93%
Date of short term deposit | Nov. 29, 2019 | Dec. 17, 2018
Short term deposits, Maturity | Feb. 13, 2020 | Jan. 31, 2019
Notional amount | $ 1,500 | $ 1,400
Accrued income | 5 | 2
Short-term deposits, classified as cash equivalents | $ 1,505 | $ 1,402
Short term deposit Fifteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Corpbanca | Itau-Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 2.80% | 3.30%
Date of short term deposit | Nov. 12, 2019 | Dec. 17, 2018
Short term deposits, Maturity | Jan. 28, 2020 | Jan. 31, 2019
Notional amount | $ 2,000 | $ 1,400
Accrued income | 8 | 2
Short-term deposits, classified as cash equivalents | $ 2,008 | $ 1,402
Short term deposit Sixteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Santander - Santiago | Itau-Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 2.33% | 3.40%
Date of short term deposit | Oct. 16, 2019 | Dec. 17, 2018
Short term deposits, Maturity | Jan. 12, 2020 | Jan. 31, 2019
Notional amount | $ 1,000 | $ 3,000
Accrued income | 5 | 4
Short-term deposits, classified as cash equivalents | $ 1,005 | $ 3,004
Short term deposit Seventeen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Scotiabank Sud Americano | Banco de Chile
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 2.45% | 3.06%
Date of short term deposit | Dec. 17, 2019 | Dec. 17, 2018
Short term deposits, Maturity | Jan. 13, 2020 | Jan. 31, 2019
Notional amount | $ 3,600 | $ 1,700
Accrued income | 3 | 2
Short-term deposits, classified as cash equivalents | 3,603 | $ 1,702
Short term deposit Eighteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Scotiabank Sud Americano
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | US$
Short term deposits, Interest rate |  | 2.95%
Date of short term deposit |  | Dec. 17, 2018
Short term deposits, Maturity |  | Jan. 31, 2019
Notional amount | 500 | $ 1,500
Accrued income | 2 | 2
Short-term deposits, classified as cash equivalents | $ 502 | $ 1,502
Short term deposit Nineteen [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Scotiabank Sud Americano | Banco de Chile
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 3.40% | 3.26%
Date of short term deposit | Dec. 02, 2019 | Dec. 19, 2018
Short term deposits, Maturity | Feb. 27, 2020 | Jan. 31, 2019
Notional amount | $ 2,000 | $ 800
Accrued income | 5 | 1
Short-term deposits, classified as cash equivalents | $ 2,005 | $ 801
Short term deposit Twenty [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Scotiabank Sud Americano | Banco Crédito e Inversiones
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 3.45% | 3.42%
Date of short term deposit | Nov. 18, 2019 | Dec. 26, 2018
Short term deposits, Maturity | Jan. 30, 2020 | Feb. 26, 2019
Notional amount | $ 1,500 | $ 2,800
Accrued income | 6 | 1
Short-term deposits, classified as cash equivalents | $ 1,506 | $ 2,801
Short term deposit Twenty One [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | BBVA Banco Francés | Banco de Chile
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 39.00% | 3.26%
Date of short term deposit | Dec. 26, 2019 | Dec. 26, 2018
Short term deposits, Maturity | Jan. 27, 2020 | Feb. 26, 2019
Notional amount | $ 52 | $ 2,800
Accrued income | 1 | 1
Short-term deposits, classified as cash equivalents | $ 53 | $ 2,801
Short term deposit Twenty Two [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Itaú S.A. | Scotiabank Sud Americano (*)
Description of type of deposit | On demand | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 8.00% | 0.26%
Date of short term deposit | Oct. 17, 2019 | Dec. 27, 2018
Short term deposits, Maturity | Dec. 31, 2019 | Jan. 07, 2019
Notional amount | $ 64 | $ 1,439
Accrued income | 0 | 1
Short-term deposits, classified as cash equivalents | $ 64 | $ 1,440
Short term deposit Twenty Three [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Scotiabank Sud Americano (*)
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | Ch$
Short term deposits, Interest rate |  | 0.26%
Date of short term deposit |  | Dec. 27, 2018
Short term deposits, Maturity |  | Jan. 14, 2019
Notional amount |  | $ 2,879
Accrued income |  | 1
Short-term deposits, classified as cash equivalents |  | $ 2,880
Short term deposit Twenty Four [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Scotiabank Sud Americano (*)
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | Ch$
Short term deposits, Interest rate |  | 0.26%
Date of short term deposit |  | Dec. 27, 2018
Short term deposits, Maturity |  | Jan. 21, 2019
Notional amount |  | $ 1,439
Accrued income |  | 1
Short-term deposits, classified as cash equivalents |  | $ 1,440
Short term deposit Twenty Five [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Banco Estado
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | US$
Short term deposits, Interest rate |  | 3.15%
Date of short term deposit |  | Dec. 28, 2018
Short term deposits, Maturity |  | Jan. 28, 2019
Notional amount |  | $ 2,000
Accrued income |  | 1
Short-term deposits, classified as cash equivalents |  | $ 2,001
Short term deposit Twenty Six [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Banco Estado
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | US$
Short term deposits, Interest rate |  | 3.15%
Date of short term deposit |  | Dec. 28, 2018
Short term deposits, Maturity |  | Jan. 28, 2019
Notional amount |  | $ 600
Accrued income |  | 0
Short-term deposits, classified as cash equivalents |  | $ 600
Short term deposit Twenty Seven [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Banco de Chile
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | US$
Short term deposits, Interest rate |  | 3.16%
Date of short term deposit |  | Dec. 28, 2018
Short term deposits, Maturity |  | Jan. 28, 2019
Notional amount |  | $ 2,000
Accrued income |  | 1
Short-term deposits, classified as cash equivalents |  | $ 2,001
Short term deposit Twenty Eight [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Banco Crédito e Inversiones
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | US$
Short term deposits, Interest rate |  | 2.53%
Date of short term deposit |  | Dec. 28, 2018
Short term deposits, Maturity |  | Jan. 08, 2019
Notional amount |  | $ 1,000
Accrued income |  | 0
Short-term deposits, classified as cash equivalents |  | $ 1,000
Short term deposit Twenty Nine [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Banco Crédito e Inversiones
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | US$
Short term deposits, Interest rate |  | 3.08%
Date of short term deposit |  | Dec. 28, 2018
Short term deposits, Maturity |  | Jan. 28, 2019
Notional amount |  | $ 2,500
Accrued income |  | 1
Short-term deposits, classified as cash equivalents |  | $ 2,501
Short term deposit Thirty [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Banco Santander- Santiago (*)
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | Ch$
Short term deposits, Interest rate |  | 0.20%
Date of short term deposit |  | Dec. 28, 2018
Short term deposits, Maturity |  | Jan. 04, 2019
Notional amount |  | $ 432
Accrued income |  | 0
Short-term deposits, classified as cash equivalents |  | $ 432
Short term deposit Thirty One [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | BBVA Banco Francés
Description of type of deposit |  | Fixed term
Short term deposits, original currency |  | US$
Short term deposits, Interest rate |  | 0.00%
Date of short term deposit |  | Dec. 31, 2018
Short term deposits, Maturity |  | Jan. 21, 2019
Notional amount |  | $ 81
Accrued income |  | 3
Short-term deposits, classified as cash equivalents |  | $ 84
Short term deposit Thirty Two [Member] |  |
Cash And Cash Equivalents [Line Items] |  |
Name of the receiver of deposit |  | Nedbank
Description of type of deposit |  | On demand
Short term deposits, original currency |  | US$
Short term deposits, Interest rate |  | 0.00%
Date of short term deposit |  | Dec. 31, 2018
Short term deposits, Maturity |  | Jan. 01, 2019
Notional amount |  | $ 647
Accrued income |  | 0
Short-term deposits, classified as cash equivalents |  | $ 647

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