Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 385,903	$ 163,240
Investments in marketable securities	171,057	320,029
Accounts receivable	51,427	46,923
Inventories	22,072	19,556
Prepaid expenses and other current assets	20,081	29,721
Total current assets	650,540	579,469
Operating lease right-of-use assets, net	21,270	23,296
Property and equipment, less accumulated depreciation of $18,789 and $14,487 at September 30, 2021 and December 31, 2020, respectively	41,991	43,863
In-process research & development	23,000	23,000
Goodwill	197,797	197,797
Other non-current assets	22,077	19,095
Total Assets	956,675	886,520
Current liabilities:
Accounts payable	24,474	17,063
Accrued expenses and other current liabilities	72,453	96,841
Contingent consideration payable	17,000	8,900
Operating lease liabilities	7,175	6,872
Total current liabilities	121,102	129,676
Deferred reimbursements	7,406	7,406
Long-term debt	388,719	389,254
Contingent consideration payable	7,605	16,925
Deferred income taxes	4,896	4,896
Operating lease liabilities	43,495	45,604
Other non-current liabilities	6,823	6,379
Total liabilities	580,046	600,140
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 500,000,000 shares authorized, 278,585,092 and 262,063,461 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively	2,805	2,650
Additional paid-in capital	2,579,953	2,308,578
Accumulated other comprehensive income (loss):
Foreign currency translation adjustment	6,617	8,412
Unrealized loss on available-for-sale securities	(184)	(185)
Warrants	83	12,387
Accumulated deficit	(2,212,645)	(2,045,462)
Total stockholders’ equity	376,629	286,380
Total Liabilities and Stockholders’ Equity	$ 956,675	$ 886,520