Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Product and product-related services	$ 6,797,255	$ 5,132,730
Collaborative development services	7,962,312
Total revenue	14,759,567	5,132,730
Cost of revenue	4,971,806	4,135,884
Gross margin	9,787,761	996,846
Operating expenses:
Selling, general and administrative	17,513,742	17,427,777
Research and development	9,996,627	7,900,311
Total operating expenses	27,510,369	25,328,088
Operating loss	(17,722,608)	(24,331,242)
Other income (expense):
Interest expense	(1,307,674)	(1,867,466)
Interest income	73,178	112,413
Other income	8	56,863
Total other income (expense)	(1,234,488)	(1,698,190)
Net loss before income taxes	(18,957,096)	(26,029,432)
Provision for income taxes	2,921	10,118
Net loss	$ (18,960,017)	$ (26,039,550)
Net loss per share, basic and diluted	$ (1.79)	$ (3.66)
Shares used in computing net loss per share, basic and diluted	10,597,318	7,113,075