CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Consolidated Statements of Operations
Revenues	$ 26,701	$ 20,584	$ 49,986	$ 37,844
Cost of goods sold	4,244	3,106	7,958	5,818
Gross profit	22,457	17,478	42,028	32,026
Costs and expenses:
Sales and marketing	18,467	14,026	34,901	26,495
Research and development	4,282	2,601	8,421	4,660
General and administrative	7,380	5,669	16,581	10,681
Total costs and expenses	30,129	22,296	59,903	41,836
Loss from operations	(7,672)	(4,818)	(17,875)	(9,810)
Other income (expense):
Investment income	654	156	1,370	157
Interest expense	(11)	(544)	(25)	(1,130)
Interest expense - deferred financing costs		(21)		(81)
Loss on extinguishment of debt		(2,186)		(2,186)
Other expense	6	(15)	4	(16)
Total other income (expense), net	649	(2,610)	1,349	(3,256)
Net Loss	$ (7,023)	$ (7,428)	$ (16,526)	$ (13,066)
Weighted average common shares outstanding - basic and diluted	39,174,712	36,677,074	39,055,013	35,605,054
Loss per common share - basic and diluted	$ (0.18)	$ (0.20)	$ (0.42)	$ (0.37)