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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net loss $ (11,150,792) $ (28,727,646)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 733,722 428,801
Amortization of intangible assets 658,049 712,121
Change in value of common stock warrants (467,877) (204,484)
Stock-based compensation 4,900,898 4,548,445
Issuance of shares in connection with reverse stock split 0 57,187
Amortization of premiums on investments 242,384 0
Deferred rent 308,840 589,109
Loss on disposal of fixed assets 7,899 2,959
Loss on short-term investments 1,183 1,500
(Gain) Loss on investment in affiliated entity (5,849,782) 666,212
Gain on sale of intangible assets (1,000,000) 0
Income tax benefit from other unrealized gains on securities (1,789,246) 0
Changes in operating assets and liabilities:    
Accounts receivable (8,161,066) 1,679,569
Prepaid expenses and other current assets (550,917) 51,758
Prepaid expenses and other current assets from affiliated entity 748,049 468,147
Restricted cash 0 100,762
Other assets (123,002) 0
Accounts payable and accrued expenses 3,325,939 (970,886)
Accounts payable and accrued expenses due to affiliated entity 2,784,612 (428,005)
Deferred revenue 9,625,906 (468,404)
Deferred revenue from affiliated entity 90,239 (256,251)
Net cash used in operating activities (5,664,962) (21,749,106)
Cash flows from investing activities:    
Purchases of investments (37,391,913) (19,288,154)
Maturities of investments 4,745,000 7,900,855
Purchases of capital assets (1,955,621) (1,207,874)
Proceeds from sale of intangible assets 1,000,000 0
Net cash used in investing activities (33,602,534) (12,595,173)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of issuance costs 81,902,363 59,209,182
Proceeds from stock option and warrant exercises 2,439,506 12,085,990
Other financing activities (149,559) 0
Net cash provided by financing activities 84,192,310 71,295,172
Effect of exchange rate changes on cash and cash equivalents 0 (1,689)
Increase in cash and cash equivalents 44,924,814 36,949,204
Cash and cash equivalents, beginning of period 40,543,982 33,719,796
Cash and cash equivalents, end of period 85,468,796 70,669,000
Supplemental disclosure of non-cash activities    
Amounts accrued for purchases of property and equipment 475,123 89,539
Lease incentive recorded as fixed assets and deferred rent $ 186,573 $ 933,350