OTHER CURRENT ASSETS AND OTHER NON-CURRENT ASSETS (Tables)

6 Months Ended

Jun. 30, 2018

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Summary of Other Current Assets

The following table summarizes the Company’s other current assets for each of the periods indicated:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Manufacturing-related deposits and prepaids	$	15,338	$	18,650
Leasehold improvement receivable		10,409		—
Prepaid clinical and preclinical expenses		7,286		5,175
Prepaid maintenance and license fees		2,745		1,711
Prepaid research expenses		2,472		2,896
Prepaid commercial expenses		374		1,589
Asset held for sale		—		1,501
Other prepaids		2,497		2,726
Other		1,868		2,263
Total other current assets	$	42,989	$	36,511

Summary of Other Non-current Assets

The following table summarizes the Company’s other non-current assets for each of the periods indicated:

	As of June 30, 2018		As of December 31, 2017
	(in thousands)
Manufacturing-related deposits	$	22,633	$	—
Prepaid clinical expenses		8,680		7,488
Alternative minimum tax credit		2,881		3,315
Restricted investment		1,001		784
Long-term available-for-sale securities		—		9,980
Other		240		242
Total other non-current assets	$	35,435	$	21,809