Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases

Schedule of operating and finance leases presentation in the consolidated balance sheets

		December 31,
	Balance sheet location	2019
Assets
Operating lease assets, net	Operating lease right of use assets	$	7,875
Finance lease assets, net	Finance lease right of use assets		1,602
Total lease assets			9,477
Liabilities
Current operating lease liability	Operating lease liabilities, current		1,814
Current finance lease liability	Accrued expenses and other current liabilities		159
Total current lease liabilities			1,973
Non-current operating lease liability	Operating lease liabilities, non-current		5,290
Non-current finance lease liability	Other non-current liabilities		367
Total non-current lease liabilities			5,657
Total lease liabilities		$	7,630

Summary of the effect of lease costs

		Year ended
	Income statement location	December 31, 2019
Operating lease expenses	Research and development expenses	$	1,108
	General and administrative expenses		712
Finance lease amortization expenses	Research and development expenses		350
	General and administrative expenses		14
Interest on finance lease liabilities	Interest expenses		9
Sublease income	Other income (expense)		(128)
Net lease expense		$	2,065

Summary of maturities of operating lease liabilities

	December 31, 2019
	Operating lease		Finance lease		Total
2020		1,826		155		1,981
2021		1,832		138		1,970
2022		1,830		122		1,952
2023		1,818		120		1,938
2024		128		10		138
Thereafter		—		—		—
Total lease payments		7,434		545		7,979
Less: interest		330		19		349
Present value of lease liabilities	$	7,104	$	526	$	7,630

Summary of maturities of finance lease liabilities

	December 31, 2019
	Operating lease		Finance lease		Total
2020		1,826		155		1,981
2021		1,832		138		1,970
2022		1,830		122		1,952
2023		1,818		120		1,938
2024		128		10		138
Thereafter		—		—		—
Total lease payments		7,434		545		7,979
Less: interest		330		19		349
Present value of lease liabilities	$	7,104	$	526	$	7,630

Schedule of minimum rental commitments under non-cancelable leases

Under the prior lease guidance minimum rental commitments under non-cancelable leases for each of the next five years and total thereafter as of December 31, 2018, were as follows (in thousands):

Year ending December 31	Amount
2019	$	520
2020		278
2021		43
2022		43
2023		11
Thereafter		—
Total	$	895

Schedule of weighted average remaining lease term and weighted average discount rate of operating leases

	December 31,
	2019
Weighted average remaining lease term in years	4.1
Weighted average discount rate (1)	2.3	%

(1) The majority of the contracts are concluded in euros. The discount rate was determined on a currency-equivalent basis.

Schedule of weighted average remaining lease term and weighted average discount rate of finance leases

	December 31,
	2019
Weighted average remaining lease term in years	3.9
Weighted average discount rate (1)	1.7	%

(1) The contracts are concluded in euros. The discount rate was determined on a currency-equivalent basis.