CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Total revenues	$ 7,210	$ 715	$ 9,222	$ 1,643
Operating expenses:
Cost of sales, excluding amortization of acquired intangible assets	706	0	1,035	0
Research and development	3,955	4,765	7,753	8,090
Sales and marketing	7,284	1,512	14,595	1,512
General and administrative	4,815	4,220	9,425	6,501
Amortization of acquired intangible assets	615	0	1,230	0
Total operating expenses	17,375	10,497	34,038	16,103
Loss from operations	(10,165)	(9,782)	(24,816)	(14,460)
Other income (expense):
Interest and other income, net	266	27	509	52
Interest expense	(1,599)	(720)	(2,619)	(720)
Loss on extinguishment of debt		0	(3,810)	0
Change in fair value of derivative liability		(23,953)		(26,278)
Total other expense, net	(1,333)	(24,646)	(5,920)	(26,946)
Net loss	$ (11,498)	$ (34,428)	$ (30,736)	$ (41,406)
Net loss per share - basic and diluted	$ (0.11)	$ (0.62)	$ (0.30)	$ (0.82)
Weighted average shares outstanding - basic and diluted	106,238	55,387	100,847	50,542
Net loss	$ (11,498)	$ (34,428)	$ (30,736)	$ (41,406)
Foreign currency translation adjustments	1	1	1	2
Comprehensive loss	(11,497)	(34,427)	(30,735)	(41,404)
Product [Member]
Revenues:
Total revenues	6,705	0	7,932	0
Collaborative Research and Development [Member]
Revenues:
Total revenues	5	218	70	742
Royalty Income [Member]
Revenues:
Total revenues	$ 500	$ 497	$ 1,220	$ 901