Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 210,631	$ 142,837
Investments in marketable securities	298,451	309,903
Accounts receivable	44,828	33,284
Inventories	15,767	14,041
Prepaid expenses and other current assets	15,600	20,008
Total current assets	585,277	520,073
Operating lease right-of-use assets, less accumulated amortization of $6,850 and $5,342 at September 30, 2020 and December 31, 2019, respectively	23,397	33,315
Property and equipment, less accumulated depreciation of $23,582 and $17,604 at September 30, 2020 and December 31, 2019, respectively	44,618	47,705
In-process research & development	23,000	23,000
Goodwill	197,797	197,797
Other non-current assets	26,453	28,317
Total Assets	900,542	850,207
Current liabilities:
Accounts payable	14,764	21,722
Accrued expenses and other current liabilities	89,595	99,901
Operating lease liabilities	7,368	7,189
Total current liabilities	111,727	128,812
Deferred reimbursements	8,906	8,906
Long-term debt	388,584	149,505
Contingent consideration payable	16,561	22,681
Deferred income taxes	5,051	5,051
Operating lease liabilities	44,627	53,531
Other non-current liabilities	4,817	5,296
Total liabilities	580,273	373,782
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 500,000,000 shares authorized, 259,600,650 and 255,417,869 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	2,626	2,598
Additional paid-in capital	2,274,797	2,227,225
Accumulated other comprehensive loss:
Foreign currency translation adjustment	4,576	2,785
Unrealized (loss) gain on available-for-sale securities	(56)	40
Warrants	12,387	12,387
Accumulated deficit	(1,974,061)	(1,768,610)
Total stockholders’ equity	320,269	476,425
Total Liabilities and Stockholders’ Equity	$ 900,542	$ 850,207