Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 164,573	$ 142,837
Investments in marketable securities	145,017	309,903
Accounts receivable	43,040	33,284
Inventories	12,979	14,041
Prepaid expenses and other current assets	18,275	20,008
Total current assets	383,884	520,073
Operating lease right-of-use assets, less accumulated amortization of $6,219 and $5,342 at June 30, 2020 and December 31, 2019, respectively	23,949	33,315
Property and equipment, less accumulated depreciation of $21,194 and $17,604 at June 30, 2020 and December 31, 2019, respectively	46,945	47,705
In-process research & development	23,000	23,000
Goodwill	197,797	197,797
Other non-current assets	25,876	28,317
Total Assets	701,451	850,207
Current liabilities:
Accounts payable	14,306	21,722
Accrued expenses and other current liabilities	85,478	99,901
Operating lease liabilities	8,516	7,189
Total current liabilities	108,300	128,812
Deferred reimbursements	8,906	8,906
Convertible notes	2,203	2,131
Senior secured term loan	147,834	147,374
Contingent consideration payable	20,027	22,681
Deferred income taxes	5,051	5,051
Operating lease liabilities	43,666	53,531
Other non-current liabilities	4,511	5,296
Total liabilities	340,498	373,782
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 500,000,000 shares authorized, 258,223,842 and 255,417,869 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	2,614	2,598
Additional paid-in capital	2,250,849	2,227,225
Accumulated other comprehensive loss:
Foreign currency translation adjustment	4,865	2,785
Unrealized gain on available-for-sale securities	288	40
Warrants	12,387	12,387
Accumulated deficit	(1,910,050)	(1,768,610)
Total stockholders’ equity	360,953	476,425
Total Liabilities and Stockholders’ Equity	$ 701,451	$ 850,207