Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 15,727	$ 12,337
Cost of goods sold:
Total costs of goods sold and services	8,914	6,330
Gross profit	6,813	6,007
Operating expenses:
Research and development	4,268	3,852
Selling, general and administrative	14,273	11,512
Total operating expenses	18,541	15,364
Loss from operations	(11,728)	(9,357)
Interest income (expense), net	161	21
Other income (expense), net	(167)	(47)
Loss before income taxes	(11,734)	(9,383)
Income tax benefit (provision)	124	(22)
Net loss	$ (11,610)	$ (9,405)
Reconciliation of net loss to net loss attributable to common stockholders:
Net loss per share, basic and diluted	$ (0.41)	$ (0.42)
Weighted-average common shares outstanding, basic and diluted	28,179,132	22,422,960
Product revenue
Revenue	$ 9,833	$ 9,547
Cost of goods sold:
Total costs of goods sold and services	6,186	4,248
Service and other revenue
Revenue	5,762	2,790
Cost of goods sold:
Total costs of goods sold and services	2,728	$ 2,082
Collaboration and license revenue
Revenue	$ 132