Intangible Assets

6 Months Ended

Jun. 30, 2019

5. Intangible Assets

Intangible assets consisted of the following:


		Gross Cost				Accumulated Amortization
	Remaining		June 30,		December 31,		June 30,		December 31,
	Life (years)	2019		2018		2019		2018
RHOFADE product rights	9.4	$	66,415	$	66,229	$	3,871	$	552
Other intangible assets	8.1		751		751		143		106
Total definite-lived intangible assets			67,166		66,980		4,014		658
IPR&D	na		6,629		6,629		—		—
Total intangible assets, net		$	73,795	$	73,609	$	4,014	$	658

Amortization expense was $1,679 and $0 for the three months ended June 30, 2019 and 2018, respectively, and was $3,356 and $0 for the six months ended June 30, 2019 and 2018, respectively.

As of June 30, 2019, estimated future amortization expenses are as follows:


Year Ending December 31,
2019	$	3,360
2020		6,717
2021		6,718
2022		6,717
2023		6,718
Thereafter		32,922
Total	$	63,152