Commitments and contingencies - Lease agreements (Details)
$ in Thousands |
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1 Months Ended |
3 Months Ended |
9 Months Ended |
30 Months Ended |
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Oct. 22, 2019
USD ($)
ft²
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Aug. 01, 2019
USD ($)
ft²
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Jun. 30, 2019
USD ($)
ft²
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Jun. 30, 2018
USD ($)
ft²
Option
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Apr. 30, 2016 |
Dec. 31, 2015
USD ($)
|
Dec. 31, 2019
USD ($)
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Dec. 31, 2019
USD ($)
|
Dec. 31, 2016
USD ($)
|
Jun. 30, 2019
USD ($)
|
Apr. 01, 2019
USD ($)
|
Mar. 31, 2019
USD ($)
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| Lease agreements |
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| Number of options to extend lease agreement (in years) |
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5 years
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| Monthly lease payments, inclusive of base rent and ancillary charges |
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$ 7
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| Prior notice period upon termination of lease |
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9 months
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| Base rent of monthly lease payments |
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$ 23
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$ 31
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| Leased office space | ft² |
53,000
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10,500
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18,700
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63,000
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| Rentable office space | ft² |
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106,000
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| Lease term |
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10 years
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10 years
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10 years
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| Number of options to renewal the lease | Option |
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2
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| Renewal period of lease |
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5 years
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5 years
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5 years
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| Annual rental payment |
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$ 488
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$ 2,373
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| Percentage of annual increase in lease rental expenses |
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1.60%
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3.00%
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1.60%
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| Property, plant and equipment, net |
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$ 5,654
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$ 5,654
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$ 12,159
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| Financing obligation |
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6,561
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| Right-to-use asset |
$ 18,425
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$ 2,368
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4,731
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4,731
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| Right-to-use liability |
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$ 4,363
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4,897
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4,897
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$ 4,363
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| Operating lease, remained payable |
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516
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| ASU 2016-02 |
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| Lease agreements |
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| Property, plant and equipment, net |
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$ 645
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| Long term prepaid rent |
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5,006
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| Right-to-use asset |
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789
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| Right-to-use liability |
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$ 837
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| General and administrative expenses |
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| Lease agreements |
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| Finance Lease Cost |
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90
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149
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| Research and development expenses |
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| Lease agreements |
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| Finance Lease Cost |
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$ 517
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$ 517
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| Leasehold improvements |
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| Lease agreements |
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| Property, plant and equipment, net |
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$ 11,514
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