Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 25,545	$ 21,061
Short-term investments	22,904	51,790
Accounts receivable, net	8,531	8,560
Inventories	15,197	10,941
Interest receivable	34	26
Other current assets	10,211	9,205
Total Current Assets	82,422	101,583
Restricted cash	578	590
Property and equipment, net	5,923	6,337
Goodwill	79,509	80,131
Other long term assets	1,695	203
Total Assets	216,976	239,307
Current Liabilities
Accounts payable	4,756	4,433
Accrued expenses	7,044	9,619
Deferred revenue – current portion	1,618	1,733
Contingent consideration – current portion	70	72
Deferred consideration - MST Acquisition	6,044	5,962
Total Current Liabilities	19,532	21,819
Long Term Liabilities
Deferred revenue – less current portion		109
Contingent consideration – less current portion	11,565	10,565
Notes payable – net of debt discount	29,267	28,937
Warrant liabilities	4,742	4,636
Net deferred tax liabilities	4,000	4,720
Other long term liabilities	1,104
Total Liabilities	70,210	70,786
Commitments and Contingencies (Note 17)
Stockholders’ Equity
Common stock $0.001 par value, 750,000,000 shares authorized at March 31, 2019 and December 31, 2018; 217,118,077 and 216,345,984 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	217	216
Additional paid-in capital	679,084	676,373
Accumulated deficit	(531,924)	(509,406)
Accumulated other comprehensive (loss) income	(611)	1,338
Total Stockholders’ Equity	146,766	168,521
Total Liabilities and Stockholders’ Equity	216,976	239,307
Intellectual Property, Net [Member]
Current Assets
Intangible assets	36,322	39,716
In-Process Research and Development [Member]
Current Assets
Intangible assets	$ 10,527	$ 10,747