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Cash and cash equivalents (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Cash and Cash Equivalents [Line Items] |  |
Notional amount | $ 290,397 | $ 95,623
Accrued income | 517 | 50
Short-term deposits, classified as cash equivalents | $ 290,914 | $ 95,673
Short term deposit One [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Scotiabank Sud Americano | Scotiabank Sud Americano
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.24% | 1.28%
Date of short term deposit | Nov. 21, 2017 | Dec. 29, 2016
Short term deposits, Maturity | Jan. 02, 2018 | Jan. 31, 2017
Notional amount | $ 8,943 | $ 9,900
Accrued income | 30 | 1
Short-term deposits, classified as cash equivalents | $ 8,973 | $ 9,901
Short term deposit Two [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Itau Chile | Banco de Chile
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.24% | 0.90%
Date of short term deposit | Nov. 28, 2017 | Dec. 30, 2016
Short term deposits, Maturity | Jan. 02, 2018 | Jan. 09, 2017
Notional amount | $ 15,652 | $ 15,000
Accrued income | 41 | 1
Short-term deposits, classified as cash equivalents | $ 15,693 | $ 15,001
Short term deposit Three [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Itau Chile | Banco Crédito e Inversiones
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.24% | 0.90%
Date of short term deposit | Nov. 28, 2017 | Dec. 30, 2016
Short term deposits, Maturity | Jan. 02, 2018 | Jan. 10, 2017
Notional amount | $ 15,652 | $ 10,000
Accrued income | 41 | 0
Short-term deposits, classified as cash equivalents | $ 15,693 | $ 10,000
Short term deposit Four [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco BBVA Chile | Banco Crédito e Inversiones
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.23% | 0.93%
Date of short term deposit | Nov. 28, 2017 | Oct. 11, 2016
Short term deposits, Maturity | Jan. 02, 2018 | Jan. 30, 2017
Notional amount | $ 15,652 | $ 13,000
Accrued income | 40 | 27
Short-term deposits, classified as cash equivalents | $ 15,692 | $ 13,027
Short term deposit Five [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco BBVA Chile | Banco BBVA Chile
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.23% | 0.75%
Date of short term deposit | Nov. 28, 2017 | Oct. 11, 2016
Short term deposits, Maturity | Jan. 02, 2018 | Jan. 30, 2017
Notional amount | $ 15,652 | $ 2,000
Accrued income | 40 | 3
Short-term deposits, classified as cash equivalents | $ 15,692 | $ 2,003
Short term deposit Six [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Itau Chile | Banco Santander - Santiago
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.25% | 1.21%
Date of short term deposit | Nov. 29, 2017 | Dec. 01, 2016
Short term deposits, Maturity | Feb. 27, 2018 | Jan. 03, 2017
Notional amount | $ 18,857 | $ 3,500
Accrued income | 50 | 4
Short-term deposits, classified as cash equivalents | $ 18,907 | $ 3,504
Short term deposit Seven [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Crédito e Inversiones | Banco de Chile
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.26% | 0.76%
Date of short term deposit | Dec. 12, 2017 | Dec. 07, 2016
Short term deposits, Maturity | Jan. 11, 2018 | Jan. 06, 2017
Notional amount | $ 15,982 | $ 3,900
Accrued income | 26 | 2
Short-term deposits, classified as cash equivalents | $ 16,008 | $ 3,902
Short term deposit Eight [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Crédito e Inversiones | Banco Santander - Santiago
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.26% | 0.90%
Date of short term deposit | Dec. 12, 2017 | Dec. 12, 2016
Short term deposits, Maturity | Jan. 11, 2018 | Jan. 12, 2017
Notional amount | $ 8,524 | $ 5,000
Accrued income | 14 | 2
Short-term deposits, classified as cash equivalents | $ 8,538 | $ 5,002
Short term deposit Nine [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Itau Chile | Banco de Chile
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.24% | 1.30%
Date of short term deposit | Dec. 12, 2017 | Dec. 12, 2016
Short term deposits, Maturity | Jan. 11, 2018 | Jan. 12, 2017
Notional amount | $ 15,982 | $ 1,700
Accrued income | 24 | 1
Short-term deposits, classified as cash equivalents | $ 16,006 | $ 1,701
Short term deposit Ten [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Itau Chile | Banco Crédito e Inversiones
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.24% | 0.88%
Date of short term deposit | Dec. 12, 2017 | Dec. 14, 2016
Short term deposits, Maturity | Jan. 11, 2018 | Jan. 17, 2017
Notional amount | $ 7,458 | $ 2,000
Accrued income | 11 | 1
Short-term deposits, classified as cash equivalents | $ 7,469 | $ 2,001
Short term deposit Eleven [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Crédito e Inversiones | Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.26% | 1.28%
Date of short term deposit | Dec. 14, 2017 | Dec. 20, 2016
Short term deposits, Maturity | Jan. 16, 2018 | Feb. 21, 2017
Notional amount | $ 19,780 | $ 800
Accrued income | 29 | 0
Short-term deposits, classified as cash equivalents | $ 19,809 | $ 800
Short term deposit Twelve [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Crédito e Inversiones | Scotiabank Sud Americano
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.26% | 1.28%
Date of short term deposit | Dec. 14, 2017 | Dec. 20, 2016
Short term deposits, Maturity | Jan. 16, 2018 | Feb. 21, 2017
Notional amount | $ 15,665 | $ 5,000
Accrued income | 23 | 2
Short-term deposits, classified as cash equivalents | $ 15,688 | $ 5,002
Short term deposit Thirteen [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Crédito e Inversiones | Banco Santander - Santiago
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.26% | 0.75%
Date of short term deposit | Dec. 14, 2017 | Dec. 22, 2016
Short term deposits, Maturity | Jan. 16, 2018 | Jan. 23, 2017
Notional amount | $ 11,488 | $ 3,500
Accrued income | 17 | 1
Short-term deposits, classified as cash equivalents | $ 11,505 | $ 3,501
Short term deposit Fourteen [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Crédito e Inversiones | Banco Santander - Santiago
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.26% | 1.25%
Date of short term deposit | Dec. 15, 2017 | Dec. 28, 2016
Short term deposits, Maturity | Jan. 16, 2018 | Feb. 09, 2017
Notional amount | $ 15,568 | $ 3,900
Accrued income | 22 | 1
Short-term deposits, classified as cash equivalents | $ 15,590 | $ 3,901
Short term deposit Fifteen [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Crédito e Inversiones | Banco Security
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.26% | 1.31%
Date of short term deposit | Dec. 15, 2017 | Dec. 28, 2016
Short term deposits, Maturity | Jan. 16, 2018 | Feb. 09, 2017
Notional amount | $ 15,568 | $ 3,300
Accrued income | 22 | 0
Short-term deposits, classified as cash equivalents | $ 15,590 | $ 3,300
Short term deposit Sixteen [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Crédito e Inversiones | Banco Security
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.26% | 1.00%
Date of short term deposit | Dec. 15, 2017 | Dec. 29, 2016
Short term deposits, Maturity | Jan. 16, 2018 | Jan. 30, 2017
Notional amount | $ 15,568 | $ 3,800
Accrued income | 22 | 0
Short-term deposits, classified as cash equivalents | $ 15,590 | $ 3,800
Short term deposit Seventeen [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco BBVA Chile | Banco Santander - Santiago
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | Ch$
Short term deposits, Interest rate | 0.24% | 0.31%
Date of short term deposit | Dec. 29, 2017 | Dec. 16, 2016
Short term deposits, Maturity | Jan. 10, 2018 | Jan. 02, 2017
Notional amount | $ 4,107 | $ 1,942
Accrued income | 1 | 3
Short-term deposits, classified as cash equivalents | $ 4,108 | $ 1,945
Short term deposit Eighteen [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco BBVA Chile | Corpbanca
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | Ch$ | Ch$
Short term deposits, Interest rate | 0.24% | 0.32%
Date of short term deposit | Dec. 29, 2017 | Dec. 29, 2016
Short term deposits, Maturity | Jan. 10, 2018 | Jan. 09, 2017
Notional amount | $ 2,765 | $ 597
Accrued income | 0 | 1
Short-term deposits, classified as cash equivalents | $ 2,765 | $ 598
Short term deposit Nineteen [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Santander - Santiago | Scotiabank Sud Americano
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | Ch$
Short term deposits, Interest rate | 0.28% | 0.33%
Date of short term deposit | Dec. 27, 2017 | Dec. 30, 2016
Short term deposits, Maturity | Jan. 18, 2018 | Jan. 09, 2017
Notional amount | $ 700 | $ 2,091
Accrued income | 0 | 0
Short-term deposits, classified as cash equivalents | $ 700 | $ 2,091
Short term deposit Twenty [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Santander - Santiago | Citibank New York
Description of type of deposit | Fixed term | Overnight
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 0.40% | 0.01%
Date of short term deposit | Dec. 15, 2017 | Dec. 31, 2016
Short term deposits, Maturity | Feb. 13, 2018 | Jan. 01, 2017
Notional amount | $ 15,000 | $ 1,742
Accrued income | 27 | 0
Short-term deposits, classified as cash equivalents | $ 15,027 | $ 1,742
Short term deposit Twenty One [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco Santander - Santiago | BBVA Banco Francés
Description of type of deposit | Fixed term | Fixed term
Short term deposits, original currency | US$ | US$
Short term deposits, Interest rate | 0.40% | 0.21%
Date of short term deposit | Dec. 15, 2017 | Oct. 24, 2016
Short term deposits, Maturity | Feb. 13, 2018 | Jan. 31, 2017
Notional amount | $ 14,000 | $ 199
Accrued income | 25 | 0
Short-term deposits, classified as cash equivalents | $ 14,025 | $ 199
Short term deposit Twenty Two [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Corpbanca | Nedbank
Description of type of deposit | Fixed term | On demand
Short term deposits, original currency | Ch$ | US$
Short term deposits, Interest rate | 0.22% | 0.00%
Date of short term deposit | Dec. 28, 2017 | Dec. 01, 2016
Short term deposits, Maturity | Jan. 04, 2018 | Jan. 31, 2017
Notional amount | $ 1,301 | $ 2,752
Accrued income | 0 | 0
Short-term deposits, classified as cash equivalents | $ 1,301 | $ 2,752
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 | 0.21% |
Date of short term deposit | Dec. 29, 2017 |
Short term deposits, Maturity | Jan. 05, 2018 |
Notional amount | $ 976 |
Accrued income | 0 |
Short-term deposits, classified as cash equivalents | $ 976 |
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 | 0.21% |
Date of short term deposit | Dec. 29, 2017 |
Short term deposits, Maturity | Jan. 05, 2018 |
Notional amount | $ 569 |
Accrued income | 0 |
Short-term deposits, classified as cash equivalents | $ 569 |
Short term deposit Twenty Five [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 | US$ |
Short term deposits, Interest rate | 2.45% |
Date of short term deposit | Dec. 06, 2017 |
Short term deposits, Maturity | Jan. 05, 2018 |
Notional amount | $ 3,500 |
Accrued income | 6 |
Short-term deposits, classified as cash equivalents | $ 3,506 |
Short term deposit Twenty Six [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 | 3.40% |
Date of short term deposit | Dec. 15, 2017 |
Short term deposits, Maturity | Jan. 16, 2018 |
Notional amount | $ 2,000 |
Accrued income | 3 |
Short-term deposits, classified as cash equivalents | $ 2,003 |
Short term deposit Twenty Seven [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco BBVA Chile |
Description of type of deposit | Fixed term |
Short term deposits, original currency | US$ |
Short term deposits, Interest rate | 2.80% |
Date of short term deposit | Dec. 26, 2017 |
Short term deposits, Maturity | Jan. 26, 2018 |
Notional amount | $ 2,200 |
Accrued income | 1 |
Short-term deposits, classified as cash equivalents | $ 2,201 |
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 | 2.30% |
Date of short term deposit | Dec. 27, 2017 |
Short term deposits, Maturity | Jan. 04, 2018 |
Notional amount | $ 2,300 |
Accrued income | 1 |
Short-term deposits, classified as cash equivalents | $ 2,301 |
Short term deposit Twenty Nine [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 | US$ |
Short term deposits, Interest rate | 2.88% |
Date of short term deposit | Dec. 27, 2017 |
Short term deposits, Maturity | Jan. 04, 2018 |
Notional amount | $ 2,300 |
Accrued income | 1 |
Short-term deposits, classified as cash equivalents | $ 2,301 |
Short term deposit Thirty [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | Banco BBVA Chile |
Description of type of deposit | Fixed term |
Short term deposits, original currency | US$ |
Short term deposits, Interest rate | 2.80% |
Date of short term deposit | Dec. 27, 2017 |
Short term deposits, Maturity | Jan. 04, 2018 |
Notional amount | $ 1,400 |
Accrued income | 0 |
Short-term deposits, classified as cash equivalents | $ 1,400 |
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 | 0.19% |
Date of short term deposit | Dec. 11, 2017 |
Short term deposits, Maturity | Jan. 31, 2018 |
Notional amount | $ 163 |
Accrued income | 0 |
Short-term deposits, classified as cash equivalents | $ 163 |
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. 01, 2017 |
Short term deposits, Maturity | Jan. 31, 2018 |
Notional amount | $ 3,686 |
Accrued income | 0 |
Short-term deposits, classified as cash equivalents | $ 3,686 |
Short term deposit Thirty Three [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Name of the receiver of deposit | ABN Amro Bank |
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, 2017 |
Short term deposits, Maturity | Jan. 02, 2018 |
Notional amount | $ 1,439 |
Accrued income | 0 |
Short-term deposits, classified as cash equivalents | $ 1,439 |

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