Consolidated Balance Sheets - USD ($)	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 124,664,519	$ 25,714,519
Short-term investments	14,977,200	14,509,570
Inventories	88,200	95,700
Accounts receivable	4,111,493	463,007
Prepaid expenses	1,823,150	1,247,548
Other current assets	618,880	639,957
Total current assets	146,283,442	42,670,301
Plant and equipment, net of accumulated amortization and depreciation of $28,983,407 and $28,369,982 at June 30, 2015 and December 31, 2014, respectively	6,952,418	5,996,687
Goodwill	18,774,267	17,869,023
Acquired intangible assets, net of accumulated amortization of $769,376 and $462,248 at June 30, 2015 and December 31, 2014, respectively	6,894,809	6,773,722
Other long-term assets	1,204,804	1,216,795
Total assets	180,109,740	74,526,528
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current portion, long-term debt	146,060	1,257,178
Current portion, deferred revenue	7,776,728	184,421
Accounts payable	2,662,254	1,710,946
Accrued liabilities	8,924,746	5,501,527
Other current liabilities	5,810,788	575,351
Total current liabilities	25,320,576	9,229,423
Other long-term debt	11,281,396	4,769,359
Deferred revenue	16,370,908	3,009,568
Contingent royalty obligation	21,647,000	15,279,000
Contingent purchase price consideration	10,741,000	16,420,300
Other long-term liabilities	$ 7,558,579	$ 2,800,491
Commitments and contingencies
STOCKHOLDERS’ EQUITY
Common stock, par value $0.01 per share; 140,000,000 shares authorized; 84,257,543 and 62,720,065 shares issued at June 30, 2015 and December 31, 2014, respectively	$ 842,575	$ 627,201
Additional paid-in capital	837,463,987	715,667,633
Accumulated other comprehensive loss	(658,405)	(1,970,420)
Accumulated deficit	(750,458,192)	(691,306,343)
Total stockholders’ equity	87,190,281	23,018,387
Total liabilities and stockholders’ equity	180,109,740	74,526,528
Series A-1 convertible preferred stock [Member]
STOCKHOLDERS’ EQUITY
Preferred stock, par value $0.01 per share; 5,000,000 shares authorized:	$ 316	$ 316