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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue, net	$ 40,855	$ 68,755
Cost of revenue (1)	20,670	34,260
Gross profit	20,185	34,495
Operating expenses:
Research and development (2)	25,040	26,018
Selling, general and administrative (3)	19,840	21,202
Restructuring	2,041	398
Total operating expenses	46,921	47,618
Loss from operations	(26,736)	(13,123)
Interest income and other, net	9	594
Gain on loan extinguishment	796	0
Gain on sale of patents	0	3,905
Total other income, net	805	4,499
Loss before income taxes	(25,931)	(8,624)
Provision for income taxes	598	453
Net loss	$ (26,529)	$ (9,077)
Net loss per share - basic and diluted	$ (0.65)	$ (0.24)
Weighted average shares outstanding - basic and diluted	40,712	37,851

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