Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Total revenues	$ 24,168	$ 34,301	$ 54,662	$ 63,402
Operating costs and expenses:
Selling, general and administrative	23,451	17,421	47,556	36,525
Research and development	21,488	15,167	39,382	29,945
Amortization of intangible assets	6,934	6,901	13,880	13,790
Total operating costs and expenses	58,479	52,910	114,238	103,920
Loss from operations	(34,311)	(18,609)	(59,576)	(40,518)
Other income (expense):
Interest expense, net	(242)	(2,131)	(472)	(4,182)
Change in fair value of contingent consideration related to acquisitions	(192)	(97)	(483)	(294)
Other income, net	48,492	240	58,463	650
Total other income (expense)	48,058	(1,988)	57,508	(3,826)
Income (loss) before income taxes	13,747	(20,597)	(2,068)	(44,344)
Provision for income taxes	(3)	(255)	(6)	(54)
Net income (loss)	$ 13,744	$ (20,852)	$ (2,074)	$ (44,398)
Net income (loss) per share:
Basic ($ per share)	$ 0.13	$ (0.27)	$ (0.02)	$ (0.57)
Diluted ($ per share)	$ 0.13	$ (0.27)	$ (0.02)	$ (0.57)
Weighted average shares outstanding:
Basic (shares)	102,597,059	78,576,260	101,747,416	78,366,610
Diluted (shares)	112,617,150	78,576,260	101,747,416	78,366,610
Product [Member]
Revenue:
Total revenues	$ 23,753	$ 31,156	$ 51,863	$ 57,001
Operating costs and expenses:
Cost of sales and service revenue	6,606	11,303	13,420	19,439
License and Service [Member]
Revenue:
Total revenues	415	3,145	2,799	6,401
Service [Member]
Operating costs and expenses:
Cost of sales and service revenue	$ 0	$ 2,118	$ 0	$ 4,221