CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Total revenues	$ 34,437	$ 20,365
Operating expenses:
Cost of sales, excluding amortization of acquired intangible assets	5,824	2,687
Research and development	17,424	15,368
Sales and marketing	25,293	29,772
General and administrative	20,726	17,939
Amortization of acquired intangible assets	2,460	2,460
Total operating expenses	71,727	68,226
Loss from operations	(37,290)	(47,861)
Other income (expense):
Interest and other income, net	58	1,054
Interest expense	(7,257)	(6,176)
Loss on extinguishment of debt	(905)	(3,810)
Total other expense, net	(8,104)	(8,932)
Net loss	$ (45,394)	$ (56,793)
Net loss per share:
Basic and diluted	$ (3.54)	$ (5.44)
Weighted average common shares outstanding:
Basic and diluted	12,836	10,431
Net loss	$ (45,394)	$ (56,793)
Other comprehensive income (loss):
Foreign currency translation adjustments	1	1
Other comprehensive income (loss)	1	1
Comprehensive loss	(45,393)	(56,792)
Product [Member]
Revenues:
Total revenues	20,831	16,824
License and Collaboration Agreement [Member]
Revenues:
Total revenues	11,942	1,361
Royalty Income [Member]
Revenues:
Total revenues	$ 1,664	$ 2,180