Income Taxes -Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Federal and state operating loss carryforwards	$ 8,805	$ 1,791
Foreign operating loss carryforwards	148	54
Acquired intangibles	2,167	2,315
Stock-based compensation	32
Lease Liability	32
Other	29
Research and development credit carryforwards	341	185
Total deferred tax assets	11,554	4,345
Total deferred tax assets, net of valuation allowance	34	3
Deferred tax liabilities:
ROU Asset	(32)
Lease liabilities and other	(2)	(3)
Domestic
Deferred tax assets:
Valuation allowance	(11,372)	(4,288)
Foreign
Deferred tax assets:
Valuation allowance	$ (148)	$ (54)