Income taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income taxes

Schedule of components of income (loss) before income taxes

	Year Ended December 31,
	2019		2018		2017
United States	$	(40,010)	$	(31,436)	$	(27,019)
Foreign		(973)		(75)		—
	$	(40,983)	$	(31,511)	$	(27,019)

Schedule of provision for (benefit from) income taxes

	Year Ended
	December 31,
	2019		2018		2017
Current:
United States
Federal	$	—	$	—	$	—
State		(20)		(18)		—
Foreign		(93)		—		—
Total current income tax provision		(113)		(18)		—
Deferred
United States
Federal		(3)		(2)		—
State		(1)		(5)		—
Foreign		304		—		—
Total deferred income tax benefit (provision)		300		(7)		—
Total income tax benefit (provision)	$	187	$	(25)	$	—

Schedule of reconciliation of the federal statutory income tax rate to the effective tax rate

	Year Ended December 31,
	2019		2018
Federal statutory income tax rate	21.0	%	21.0	%
Foreign tax rate differential	—	%	—	%
State taxes, net of federal benefit	3.2	%	6.0	%
Tax credits	2.3	%	2.7	%
Share-based compensation	2.3	%	1.1	%
Permanent items	(0.9)	%	(1.2)	%
Defereed tax rate changes	(1.4)	%	—	%
Change in valuation allowance	(24.6)	%	(29.9)	%
Other	(1.4)	%	0.2	%
Effective income tax rate	0.5	%	(0.1)	%

Schedule of deferred tax assets and liabilities

	December 31,
	2019		2018
Deferred tax assets:
Net operating loss carryforwards	$	43,814	$	35,623
Tax credits		5,518		4,678
Deferred revenue		1,247		1,614
Depreciation		—		86
Amortization		928		792
Stock-based compensation		973		541
Deferred Rent		727		—
Lease incentive obligation		1,828		—
Other deferred tax assets		1,325		1,378
Total deferred tax assets		56,360		44,712
Less: Valuation allowances		(54,137)		(44,033)
Net deferred tax assets		2,223		679
Deferred tax liabilities:
Section 481(a) adjustment - accrued bonus		—		(59)
Depreciation		(1,769)		—
Amortization of acquired intangibles		(3,031)		(610)
Inventory		(212)		—
Goodwill		(31)		(17)
Other deferred tax liabitlies		(5)		—
Net deferred tax assets (liabilities)	$	(2,825)	$	(7)