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Cash and cash equivalents (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash And Cash Equivalents [Line Items]    
Notional amount $ 39,031 $ 282,914
Short-term deposits, classified as cash equivalents $ 51,595 $ 149,099
Short term deposit One [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco Santander - Santiago Banco crédito e inversiones
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.35% 3.45%
Date of short term deposit Dec. 30, 2020 Nov. 18, 2019
Expiration date Mar. 30, 2021 Feb. 13, 2020
Notional amount $ 7,000 $ 18,000
Accrued income 0 74
Short-term deposits, classified as cash equivalents $ 7,000 $ 18,074
Short term deposit Two [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 Dollar Dollar
Short term deposits, Interest rate 0.35% 2.85%
Date of short term deposit Nov. 30, 2020 Dec. 26, 2019
Expiration date Jan. 08, 2021 Feb. 20, 2020
Notional amount $ 1,500 $ 20,000
Accrued income 1 8
Short-term deposits, classified as cash equivalents $ 1,501 $ 20,008
Short term deposit Three [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco de Chile Banco de Chile
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.61% 3.45%
Date of short term deposit Nov. 30, 2020 Nov. 15, 2019
Expiration date Jan. 08, 2021 Jan. 23, 2020
Notional amount $ 2,000 $ 14,000
Accrued income 1 62
Short-term deposits, classified as cash equivalents $ 2,001 $ 14,062
Short term deposit Four [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco de Chile Banco de Chile
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.61% 3.50%
Date of short term deposit Nov. 30, 2020 Nov. 15, 2019
Expiration date Jan. 08, 2021 Jan. 09, 2020
Notional amount $ 3,500 $ 18,000
Accrued income 1 80
Short-term deposits, classified as cash equivalents $ 3,501 $ 18,080
Short term deposit Five [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 Dollar Dollar
Short term deposits, Interest rate 0.46% 3.45%
Date of short term deposit Dec. 01, 2020 Nov. 15, 2019
Expiration date Jan. 15, 2021 Jan. 16, 2020
Notional amount $ 500 $ 18,000
Accrued income 0 79
Short-term deposits, classified as cash equivalents $ 500 $ 18,079
Short term deposit Six [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Scotiabank Sud Americano Banco Itaú Corpbanca
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.40% 2.90%
Date of short term deposit Dec. 01, 2020 Dec. 26, 2019
Expiration date Jan. 15, 2021 Feb. 20, 2020
Notional amount $ 500 $ 33,000
Accrued income 0 13
Short-term deposits, classified as cash equivalents $ 500 $ 33,013
Short term deposit Seven [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 Dollar Peso
Short term deposits, Interest rate 0.40% 2.16%
Date of short term deposit Dec. 02, 2020 Dec. 30, 2019
Expiration date Jan. 20, 2021 Jan. 08, 2020
Notional amount $ 2,500 $ 6,812
Accrued income 1 0
Short-term deposits, classified as cash equivalents $ 2,501 $ 6,812
Short term deposit Eight [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco Santander - Santiago Banco crédito e inversiones
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.50% 3.51%
Date of short term deposit Dec. 09, 2020 Nov. 21, 2019
Expiration date Jan. 25, 2021 Jan. 28, 2020
Notional amount $ 500 $ 1,000
Accrued income 0 4
Short-term deposits, classified as cash equivalents $ 500 $ 1,004
Short term deposit Nine [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 Dollar Dollar
Short term deposits, Interest rate 0.50% 3.75%
Date of short term deposit Dec. 09, 2020 Dec. 02, 2019
Expiration date Jan. 25, 2021 Feb. 27, 2020
Notional amount $ 1,000 $ 2,000
Accrued income 0 6
Short-term deposits, classified as cash equivalents $ 1,000 $ 2,006
Short term deposit Ten [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco Santander - Santiago Banco crédito e inversiones
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.50% 3.60%
Date of short term deposit Dec. 09, 2020 Nov. 25, 2019
Expiration date Jan. 25, 2021 Jan. 28, 2020
Notional amount $ 6,000 $ 1,000
Accrued income 1 4
Short-term deposits, classified as cash equivalents $ 6,001 $ 1,004
Short term deposit Eleven [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 Dollar Dollar
Short term deposits, Interest rate 0.51% 2.15%
Date of short term deposit Dec. 09, 2020 Dec. 16, 2019
Expiration date Jan. 25, 2021 Jan. 06, 2020
Notional amount $ 6,000 $ 500
Accrued income 1 0
Short-term deposits, classified as cash equivalents $ 6,001 $ 500
Short term deposit Twelve [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 Dollar Dollar
Short term deposits, Interest rate 0.26% 2.55%
Date of short term deposit Dec. 14, 2020 Dec. 09, 2019
Expiration date Jan. 29, 2021 Feb. 04, 2020
Notional amount $ 500 $ 1,700
Accrued income 0 3
Short-term deposits, classified as cash equivalents $ 500 $ 1,703
Short term deposit Thirteen [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco Estado Banco Itaú Corpbanca
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.14% 2.55%
Date of short term deposit Dec. 14, 2020 Dec. 16, 2019
Expiration date Jan. 29, 2021 Jan. 06, 2020
Notional amount $ 1,000 $ 2,500
Accrued income 1 3
Short-term deposits, classified as cash equivalents $ 1,001 $ 2,503
Short term deposit Fourteen [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Scotiabank Sud Americano Banco Itaú Corpbanca
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.40% 3.64%
Date of short term deposit Dec. 14, 2020 Nov. 29, 2019
Expiration date Jan. 29, 2021 Feb. 13, 2020
Notional amount $ 1,500 $ 1,500
Accrued income 0 5
Short-term deposits, classified as cash equivalents $ 1,500 $ 1,505
Short term deposit Fifteen [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco de Chile Banco Itaú Corpbanca
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.56% 2.80%
Date of short term deposit Dec. 14, 2020 Nov. 12, 2019
Expiration date Jan. 29, 2021 Jan. 28, 2020
Notional amount $ 5,000 $ 2,000
Accrued income 1 8
Short-term deposits, classified as cash equivalents $ 5,001 $ 2,008
Short term deposit Sixteen [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco Itaú Corpbanca Banco Santander - Santiago
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.68% 2.33%
Date of short term deposit Dec. 18, 2020 Oct. 16, 2019
Expiration date Jan. 01, 2021 Jan. 12, 2020
Notional amount $ 500 $ 1,000
Accrued income 0 5
Short-term deposits, classified as cash equivalents $ 500 $ 1,005
Short term deposit Seventeen [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco Itaú Corpbanca Scotiabank Sud Americano
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.68% 2.45%
Date of short term deposit Dec. 18, 2020 Dec. 17, 2019
Expiration date Feb. 01, 2021 Jan. 13, 2020
Notional amount $ 2,000 $ 3,600
Accrued income 1 3
Short-term deposits, classified as cash equivalents $ 2,001 $ 3,603
Short term deposit Eighteen [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 Dollar Dollar
Short term deposits, Interest rate 0.20% 3.20%
Date of short term deposit Dec. 23, 2020 Nov. 13, 2019
Expiration date Feb. 05, 2021 Jan. 30, 2020
Notional amount $ 2,000 $ 500
Accrued income 1 2
Short-term deposits, classified as cash equivalents $ 2,001 $ 502
Short term deposit Nineteen [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco Itaú Corpbanca Scotiabank Sud Americano
Description of type of deposit Fixed term Fixed term
Short term deposits, original currency Dollar Dollar
Short term deposits, Interest rate 0.40% 3.40%
Date of short term deposit Dec. 24, 2020 Dec. 02, 2019
Expiration date Feb. 08, 2021 Feb. 27, 2020
Notional amount $ 1,000 $ 2,000
Accrued income 0 5
Short-term deposits, classified as cash equivalents $ 1,000 $ 2,005
Short term deposit Twenty [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 Dollar Dollar
Short term deposits, Interest rate 0.26% 3.45%
Date of short term deposit Dec. 29, 2020 Nov. 18, 2019
Expiration date Jan. 08, 2021 Jan. 30, 2020
Notional amount $ 2,500 $ 1,500
Accrued income 1 6
Short-term deposits, classified as cash equivalents $ 2,501 $ 1,506
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 Dollar Dollar
Short term deposits, Interest rate 0.15% 39.00%
Date of short term deposit Dec. 30, 2020 Dec. 26, 2019
Expiration date Feb. 12, 2021 Jan. 27, 2020
Notional amount $ 700 $ 52
Accrued income 0 1
Short-term deposits, classified as cash equivalents $ 700 $ 53
Short term deposit Twenty Two [Member]    
Cash And Cash Equivalents [Line Items]    
Name of the receiver of deposit Banco Itaú Corpbanca Banco Itaú S.A.
Description of type of deposit Fixed term On demand
Short term deposits, original currency Peso Dollar
Short term deposits, Interest rate 0.35% 8.00%
Date of short term deposit Dec. 29, 2020 Oct. 17, 2019
Expiration date Jan. 05, 2021 Jan. 17, 2020
Notional amount $ 3,798 $ 64
Accrued income 0 0
Short-term deposits, classified as cash equivalents $ 3,798 64
Short term deposit Twenty Three [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 Dollar  
Short term deposits, Interest rate 1.80%  
Date of short term deposit Dec. 31, 2020  
Expiration date Mar. 06, 2021  
Notional amount $ 86  
Accrued income 0  
Short-term deposits, classified as cash equivalents 86  
Short term deposit [Member]    
Cash And Cash Equivalents [Line Items]    
Notional amount 51,584 148,728
Accrued income 11 371
Short-term deposits, classified as cash equivalents $ 51,595 $ 149,099