Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Total revenue	$ 15,030	$ 14,224	$ 30,555	$ 28,474
Cost of revenue:
Total cost of revenue	16,702	15,266	31,905	31,623
Gross profit	(1,672)	(1,042)	(1,350)	(3,149)
Operating expenses:
Research and development	7,903	6,211	14,413	12,548
Selling and marketing	3,052	3,093	5,900	8,916
General and administrative	13,858	15,227	29,497	31,015
Total operating expenses	24,813	24,531	49,810	52,479
Loss from operations	(26,485)	(25,573)	(51,160)	(55,628)
Interest income	3	87	5	782
Interest expense	(1,060)	(1,071)	(2,118)	(2,109)
Other (expense) income, net	(3,434)	405	(4,446)	3,271
Loss before provision for income taxes	(30,976)	(26,152)	(57,719)	(53,684)
Provision for income taxes	0	0	0	0
Net loss and comprehensive loss	$ (30,976)	$ (26,152)	$ (57,719)	$ (53,684)
Net loss per share, basic and diluted	$ (0.19)	$ (0.18)	$ (0.36)	$ (0.36)
Weighted-average common shares used to compute net loss per share attributable to common stockholders, basic and diluted	162,283,348	147,563,278	161,217,083	147,506,244
Product
Revenue:
Total revenue	$ 10,917	$ 10,615	$ 22,296	$ 22,085
Cost of revenue:
Total cost of revenue	12,180	12,714	22,865	25,843
Service
Revenue:
Total revenue	3,994	3,490	8,021	6,151
Cost of revenue:
Total cost of revenue	4,522	2,552	9,040	5,780
Distribution Rights
Revenue:
Total revenue	$ 119	$ 119	$ 238	$ 238