Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 160,621	$ 181,270
Accounts receivable, net	10,866	13,669
Other receivables	184	4,660
Inventory, net	13,099	11,096
Prepaid expenses and other assets	3,602	5,186
Total current assets	188,372	215,881
Restricted cash	100	100
Property and equipment, net	10,176	7,095
Lease right-of-use assets	7,317	7,443
Goodwill	2,483	2,483
Other intangible assets, net	70	87
Deferred tax asset	1,923	2,163
Other assets	59	0
Total assets	210,500	235,252
Liabilities and shareholders' equity
Accounts payable	2,371	2,420
Accrued liabilities	7,916	10,396
Current portion of lease liability	1,487	984
Deferred income	27	19
Total current liabilities	11,801	13,819
Long-term portion of lease liability	7,190	7,710
Other liabilities	250	32
Total liabilities	19,241	21,561
Commitments and contingencies (Note 12)
Shareholders' equity:
Ordinary shares, £0.006705 nominal value; 39,068,071 and 39,824,703 shares authorized at September 30, 2020 and December 31, 2019, respectively, and 25,961,817 and 26,419,961 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	272	276
Additional paid-in capital	301,347	304,909
Accumulated deficit	(101,484)	(84,033)
Accumulated other comprehensive loss	(8,876)	(7,461)
Total shareholders' equity	191,259	213,691
Total liabilities and shareholders' equity	$ 210,500	$ 235,252