Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Revenue	$ 2,024,000	$ 5,422,000	$ 7,844,000	$ 16,578,000
Cost of revenue	3,446,000	4,249,000	9,849,000	10,536,000
Gross (loss) profit	(1,422,000)	1,173,000	(2,005,000)	6,042,000
Operating Expenses (Income)
Research and development	5,884,000	4,838,000	17,834,000	15,384,000
Sales and marketing	6,883,000	5,819,000	22,425,000	17,835,000
General and administrative	5,908,000	3,686,000	14,959,000	9,989,000
Amortization of intangible assets	2,558,000	2,674,000	7,754,000	8,244,000
Change in fair value of contingent consideration	(11,647,000)	(1,358,000)	(9,689,000)	81,000
Acquisition related costs	(40,000)	345,000	5,000	345,000
Goodwill impairment	78,969,000	0	78,969,000	0
Intangible assets impairment	7,912,000	0	7,912,000	0
Loss (gain) from sale of SurgiBot assets, net	0	44,000	97,000	(11,915,000)
Reversal of transfer fee accrual	0	(2,994,000)	0	(2,994,000)
Total Operating Expenses	96,427,000	13,054,000	140,266,000	36,969,000
Operating Loss	(97,849,000)	(11,881,000)	(142,271,000)	(30,927,000)
Other Income (Expense)
Change in fair value of warrant liabilities	614,000	(8,760,000)	3,036,000	(24,438,000)
Interest income	63,000	391,000	559,000	982,000
Interest expense	(1,230,000)	(685,000)	(3,407,000)	(3,398,000)
Other expense	(439,000)	(52,000)	(935,000)	(109,000)
Total Other Income (Expense), net	(992,000)	(9,106,000)	(747,000)	(26,963,000)
Loss before income taxes	(98,841,000)	(20,987,000)	(143,018,000)	(57,890,000)
Income tax benefit	1,070,000	781,000	2,549,000	2,554,000
Net loss	(97,771,000)	(20,206,000)	(140,469,000)	(55,336,000)
Comprehensive loss
Foreign currency translation loss	(3,670,000)	(561,000)	(4,379,000)	(2,651,000)
Comprehensive loss	$ (101,441,000)	$ (20,767,000)	$ (144,848,000)	$ (57,987,000)
Net loss per common share:
Basic (in dollars per share)	$ (0.43)	$ (0.10)	$ (0.64)	$ (0.27)
Diluted (in dollars per share)	$ (0.43)	$ (0.10)	$ (0.64)	$ (0.27)
Weighted average number of shares used in computing net loss per common share:
Basic (in shares)	229,178	209,088	221,193	204,531
Diluted (in shares)	230,634	209,088	223,705	204,531