Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 114,172	$ 26,731
Restricted cash	1,551	1,544
Investments	22,054	77,736
Receivables from collaborations	22,146	4,293
Inventory		1,649
Prepaid expenses and other current assets	4,422	2,399
Total current assets	164,345	114,352
Investments		22,376
Property and equipment, net	7,347	9,135
Other assets	3,590	978
Total assets	175,282	146,841
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	13,988	7,769
Accrued expenses	21,365	15,891
Interest payable	14,904	11,848
Deferred collaboration revenue	2,120	221
Lease financing obligation	1,377	47
Senior credit facility	9,020	4,580
Non-recourse notes payable	29,561	29,121
Total current liabilities	92,335	69,477
Deferred rent		54
Lease financing obligation	3,406	2,703
Senior credit facility	41,289	25,372
Stockholders’ equity:
Preferred stock, $0.001 par value; shares authorized — 5,000; no shares outstanding
Common stock, $0.01 par value; shares authorized — 200,000; shares issued and outstanding — 154,082 at December 31, 2019 and 110,063 at December 31, 2018	1,541	1,101
Additional paid-in capital	877,300	780,400
Accumulated other comprehensive income (loss)	39	(297)
Accumulated deficit	(840,628)	(731,969)
Total stockholders’ equity	38,252	49,235
Total liabilities and stockholders’ equity	$ 175,282	$ 146,841