Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 3,639	$ 6,389	$ 5,820	$ 11,156
Cost of revenue	3,936	3,732	6,403	6,287
Gross (loss) profit	(297)	2,657	(583)	4,869
Operating Expenses (Income)
Research and development	6,295	5,281	11,950	10,546
Sales and marketing	7,868	6,046	15,542	12,016
General and administrative	4,489	3,627	9,049	6,303
Amortization of intangible assets	2,585	2,743	5,196	5,570
Change in fair value of contingent consideration	960	812	1,958	1,439
Acquisition related costs	0	0	45	0
Loss (gain) from sale of SurgiBot assets, net	0	37	97	(11,959)
Total Operating Expenses	22,197	18,546	43,837	23,915
Operating Loss	(22,494)	(15,889)	(44,420)	(19,046)
Other Income (Expense)
Change in fair value of warrant liabilities	2,528	(17,507)	2,422	(15,678)
Interest income	178	320	496	590
Interest expense	(1,061)	(2,056)	(2,177)	(2,712)
Other (expense) income	(191)	1	(496)	(57)
Total Other Income (Expense), net	1,454	(19,242)	245	(17,857)
Loss before income taxes	(21,040)	(35,131)	(44,175)	(36,903)
Income tax benefit	869	883	1,479	1,773
Net loss	(20,171)	(34,248)	(42,696)	(35,130)
Comprehensive loss
Foreign currency translation gain (loss)	1,240	(4,398)	(709)	(2,090)
Comprehensive loss	$ (18,931)	$ (38,646)	$ (43,405)	$ (37,220)
Net loss per common share:
Basic (in dollars per share)	$ (0.09)	$ (0.17)	$ (0.20)	$ (0.17)
Diluted (in dollars per share)	$ (0.10)	$ (0.17)	$ (0.21)	$ (0.17)
Weighted average number of shares used in computing net loss per common share:
Basic (in shares)	217,471	204,504	217,135	202,214
Diluted (in shares)	218,579	204,504	218,579	202,214