Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 21,061	$ 91,217
Short-term investments	51,790
Accounts receivable, net	8,560	1,536
Inventories	10,941	10,817
Interest receivable	26	80
Other current assets	9,205	9,344
Total Current Assets	101,583	112,994
Restricted cash	590	6,389
Property and equipment, net	6,337	6,670
Goodwill	80,131	71,368
Other long term assets	203	192
Total Assets	239,307	250,251
Current Liabilities
Accounts payable	4,433	3,771
Accrued expenses	9,619	10,974
Deferred revenue – current portion	1,733	1,088
Deferred gain on sale of SurgiBot assets		7,500
Contingent consideration – current portion	72	719
Deferred consideration - MST Acquisition	5,962
Notes payable – current portion, net of debt discount		4,788
Total Current Liabilities	21,819	28,840
Long Term Liabilities
Deferred revenue – less current portion	109
Contingent consideration – less current portion	10,565	11,699
Notes payable – less current portion, net of debt discount	28,937	8,385
Warrant liabilities	4,636	14,090
Net deferred tax liabilities	4,720	8,389
Total Liabilities	70,786	71,403
Commitments and Contingencies
Stockholders’ Equity
Common stock $0.001 par value, 750,000,000 shares authorized at December 31, 2018 and 2017, respectively; 216,345,984 and 199,282,003 shares issued and outstanding at December 31, 2018 and 2017, respectively	216	199
Additional paid-in capital	676,373	621,261
Accumulated deficit	(509,406)	(447,640)
Accumulated other comprehensive income	1,338	5,028
Total Stockholders’ Equity	168,521	178,848
Total Liabilities and Stockholders’ Equity	239,307	250,251
Intellectual Property, Net [Member]
Current Assets
Intangible assets	39,716	$ 52,638
In-Process Research and Development [Member]
Current Assets
Intangible assets	$ 10,747