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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net loss $ (10,830,868) $ (8,858,280)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 115,517 39,841
Amortization of intangible assets 239,813 447,927
Change in value of common stock warrants 505,926 1,427,616
Stock-based compensation 2,519,048 519,218
Interest income accrued on short-term investments 0 (506)
Deferred rent 144,521 (6,727)
Loss on disposal of fixed assets 2,959 0
Loss on investment in affiliated entity 376,963 836,084
Transaction costs associated with issuance of warrants 0 315,970
Changes in operating assets and liabilities:    
Accounts receivable 601,993 (198,725)
Accounts receivable from affiliated entity (18,652) (7,303)
Prepaid expenses and other current assets 129,671 188,284
Prepaid expenses and other current assets from affiliated entity 284,033 54,673
Restricted cash (87) (87)
Other assets 0 650
Accounts payable and accrued expenses 73,484 180,041
Accounts payable and accrued expenses due to affiliated entity 257,245 190,457
Deferred revenue 147,502 (153,088)
Deferred revenue from affiliated entity (106,251) (106,250)
Net cash used in operating activities (5,557,183) (5,130,205)
Cash flows from investing activities:    
Purchases of investments (5,999,640) (400,000)
Maturities of investments 6,900,000 450,507
Purchases of capital assets (181,760) (39,709)
Net cash provided by investing activities 718,600 10,798
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants, net of issuance costs 59,209,182 19,556,383
Proceeds from stock option and warrant exercises 10,682,201 4,991
Net cash provided by financing activities 69,891,383 19,561,374
Effect of exchange rate changes on cash and cash equivalents (1,689) (1,189)
Increase in cash and cash equivalents 65,051,111 14,440,778
Cash and cash equivalents, beginning of period 33,719,796 5,646,021
Cash and cash equivalents, end of period 98,770,907 20,086,799
Supplemental disclosure of non-cash activities    
Lease incentive $ 50,000 $ 0