Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 66,263	$ 90,332
Accounts receivable, net	19,742	16,981
Inventory, net	9,835	10,142
Prepaid expenses and other assets	4,088	3,027
Total current assets	99,928	120,482
Restricted cash, non-current	200	200
Property and equipment, net	12,712	9,067
Goodwill	3,967	3,967
Other intangible assets, net	7,521	7,849
Deferred tax asset	1,435	2,486
Other assets	181	185
Total assets	125,944	144,236
Liabilities and shareholders’ equity
Accounts payable	4,186	6,842
Accrued liabilities	9,754	11,134
Settlement liability	4,451	4,342
Deferred income	46	36
Current portion of loans payable	94	91
Total current liabilities	18,531	22,445
Long-term portion of loans payable	30,136	29,904
Settlement liability	3,991	3,894
Other liabilities	122	364
Total liabilities	52,780	56,607
Commitments and contingencies (Notes 3, 8, and 12)
Shareholders' equity:
Ordinary shares, £0.006705 nominal value; 36,183,293 shares authorized at June 30, 2018 and December 31, 2017, and 25,957,954 and 25,661,634 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	272	269
Additional paid-in capital	297,906	294,613
Accumulated deficit	(218,338)	(201,541)
Accumulated other comprehensive loss	(6,676)	(5,712)
Total shareholders’ equity	73,164	87,629
Total liabilities and shareholders’ equity	$ 125,944	$ 144,236