Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 7,968	$ 71,157
Restricted cash	5,316	527
Short-term investments	24,909
Accounts receivable, net	4,974	4,017
Inventory	3,963	3,597
Prepaid expenses and other current assets	2,704	2,556
Total current assets	49,834	81,854
Property and equipment, net	27,146	25,602
Right-of-use and other assets	4,815	249
Total assets	81,795	107,705
Current liabilities:
Accounts payable	7,533	5,379
Accrued expenses and other current liabilities	16,452	15,022
Facility financing obligation	8,974	11,298
Deferred revenue - current	32,370	36,885
Recognized loss on purchase commitments - current	11,649	6,657
Total current liabilities	76,978	75,241
Senior convertible notes	19,031	19,099
Note payable to related party	71,981	72,089
Accrued interest - note payable to related party	9,132	6,835
Recognized loss on purchase commitments - long term	81,978	91,642
Deferred revenue - long term	8,399	10,680
Milestone rights liability	7,201	7,201
Operating lease liabilities	3,094
Total liabilities	277,794	282,787
Commitments and contingencies
Stockholders' deficit:
Common stock, $0.01 par value - 280,000,000 shares authorized, 189,447,055 and 187,029,967 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	1,894	1,870
Additional paid-in capital	2,769,396	2,763,067
Accumulated other comprehensive loss	(19)	(19)
Accumulated deficit	(2,967,270)	(2,940,000)
Total stockholders' deficit	(195,999)	(175,082)
Total liabilities and stockholders' deficit	$ 81,795	$ 107,705